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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2017	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Trading Symbol	IOSP
Entity Registrant Name	INNOSPEC INC.
Entity Central Index Key	0001054905
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		24,136,643

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 326.3	$ 228.0	$ 620.6	$ 440.1
Cost of goods sold	(221.2)	(142.5)	(424.6)	(278.4)
Gross profit	105.1	85.5	196.0	161.7
Operating expenses:
Selling, general and administrative	(60.9)	(53.1)	(116.2)	(97.0)
Research and development	(8.5)	(6.2)	(15.9)	(13.1)
Adjustment to fair value of contingent consideration	0.0	2.4	0.0	4.0
Loss on disposal of subsidiary	(1.0)	0.0	(1.0)	(1.4)
Foreign exchange loss on liquidation of subsidiary	0.0	0.0	(1.8)	0.0
Total operating expenses	(70.4)	(56.9)	(134.9)	(107.5)
Operating income	34.7	28.6	61.1	54.2
Other net income	2.1	8.5	1.1	8.2
Interest expense, net	(2.0)	(0.7)	(4.2)	(1.5)
Income before income taxes	34.8	36.4	58.0	60.9
Income taxes	(8.7)	(7.5)	(14.7)	(13.1)
Net income	$ 26.1	$ 28.9	$ 43.3	$ 47.8
Earnings per share:
Basic	$ 1.08	$ 1.21	$ 1.80	$ 1.99
Diluted	$ 1.06	$ 1.18	$ 1.76	$ 1.95
Weighted average shares outstanding (in thousands):
Basic	24,133	23,973	24,110	23,996
Diluted	24,555	24,443	24,558	24,462

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 26.1	$ 28.9	$ 43.3	$ 47.8
Other comprehensive income:
Changes in cumulative translation adjustment, net of tax of $(0.7) million, $(1.2) million, $(0.8) million and $(0.8) million, respectively	9.1	(1.8)	12.6	(0.2)
Changes in unrealized gains on derivative instruments, net of tax of $0.1 million, $0.0 million, $0.0 million and $0.0 million, respectively	(0.2)	0.0	0.0	0.0
Amortization of prior service credit, net of tax of $0.0 million, $0.0 million, $0.1 million and $0.1 million, respectively	(0.2)	(0.3)	(0.4)	(0.5)
Amortization of actuarial net losses, net of tax of $(0.3) million, $(0.1) million, $(0.5) million and $(0.3) million, respectively	1.0	0.6	2.0	1.1
Total other comprehensive income/(loss)	9.7	(1.5)	14.2	0.4
Total comprehensive income	$ 35.8	$ 27.4	$ 57.5	$ 48.2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Changes in cumulative translation adjustment, tax	$ (0.7)	$ (1.2)	$ (0.8)	$ (0.8)
Changes in unrealized gains on derivative instrument, tax	0.1	0.0	0.0	0.0
Amortization of prior service credit, tax	0.0	0.0	0.1	0.1
Amortization of actuarial net losses, tax	$ (0.3)	$ (0.1)	$ (0.5)	$ (0.3)

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 48.8	$ 101.9
Trade and other accounts receivable (less allowances of $4.3 million and $4.7 million respectively)	241.6	154.4
Inventories (less allowances of $9.7 million and $8.6 million respectively):
Finished goods	149.6	118.1
Raw materials	68.0	55.7
Total inventories	217.6	173.8
Prepaid expenses	5.0	6.2
Prepaid income taxes	6.9	4.8
Total current assets	519.9	441.1
Property, plant and equipment:
Gross cost	300.7	251.8
Less accumulated depreciation	(113.8)	(94.4)
Net property, plant and equipment	186.9	157.4
Goodwill	335.5	374.8
Other intangible assets	164.1	144.4
Deferred tax assets	15.5	14.9
Pension asset	52.6	48.0
Other non-current assets	2.4	0.8
Total assets	1,276.9	1,181.4
Current liabilities:
Accounts payable	108.0	59.6
Accrued liabilities	91.4	94.3
Current portion of long term debt	10.3	10.3
Current portion of finance leases	2.4	1.6
Current portion of plant closure provisions	6.1	6.7
Current portion of accrued income taxes	9.0	9.4
Current portion of acquisition-related contingent consideration	1.1	1.1
Current portion of deferred income	0.1	0.1
Total current liabilities	228.4	183.1
Long-term debt, net of current portion	238.8	258.5
Finance leases, net of current portion	3.4	2.9
Plant closure provisions, net of current portion	35.6	32.8
Unrecognized tax benefits	2.3	2.3
Deferred tax liabilities	47.3	32.3
Pension liabilities	15.7	14.2
Deferred income, net of current portion	0.5	0.5
Other non-current liabilities	0.5	1.0
Total liabilities	572.5	527.6
Equity:
Common stock, $0.01 par value, authorized 40,000,000 shares, issued 29,554,500 shares	0.3	0.3
Additional paid-in capital	316.9	315.1
Treasury stock (5,417,857 and 5,483,341 shares at cost, respectively)	(97.1)	(97.5)
Retained earnings	595.9	561.8
Accumulated other comprehensive loss	(112.0)	(126.2)
Total Innospec stockholders' equity	704.0	653.5
Non-controlling interest	0.4	0.3
Total equity	704.4	653.8
Total liabilities and equity	$ 1,276.9	$ 1,181.4

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowances for doubtful accounts	$ 4.3	$ 4.7
Inventory allowances	$ 9.7	$ 8.6
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	29,554,500	29,554,500
Treasury stock, shares	5,417,857	5,483,341

Consolidated Statements of Cash Flows - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Cash Flows from Operating Activities

Net income

$ 43.3

$ 47.8

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and amortization

^[1]

24.5

18.9

Adjustment to fair value of contingent consideration

0.0

(4.0)

Deferred taxes

3.5

1.1

Loss on disposal of subsidiary

1.0

1.4

Foreign exchange loss on liquidation of subsidiary

1.8

0.0

Cash contributions to defined benefit pension plans

(0.5)

(0.6)

Non-cash movements on defined benefit pension plans

(1.8)

(3.2)

Stock option compensation

2.2

1.9

Changes in assets and liabilities, net of effects of acquired and divested companies:

Trade and other accounts receivable

(82.1)

0.9

Inventories

(39.3)

5.7

Prepaid expenses

1.2

0.9

Accounts payable and accrued liabilities

39.8

(14.1)

Accrued income taxes

(4.3)

1.6

Plant closure provisions

2.0

0.9

Unrecognized tax benefits

0.0

(0.4)

Other non-current assets and liabilities

(2.2)

(1.7)

Net cash (used in)/provided by operating activities

(10.9)

57.1

Cash Flows from Investing Activities

Capital expenditures

(13.1)

(7.5)

Business combinations, net of cash acquired

0.0

1.8

Sale of short-term investments

0.0

4.7

Net cash used in investing activities

(13.1)

(1.0)

Cash Flows from Financing Activities

Proceeds from revolving credit facility

10.0

28.0

Repayments of revolving credit facility

(30.0)

(7.0)

Repayments of finance leases

(1.1)

(0.4)

Payment for acquisition-related contingent consideration

0.0

(44.0)

Dividend paid

(9.2)

(8.1)

Issue of treasury stock

1.0

0.3

Repurchase of common stock

(1.0)

(8.2)

Net cash used in financing activities

(30.3)

(39.4)

Effect of foreign currency exchange rate changes on cash

1.2

(0.4)

Net change in cash and cash equivalents

(53.1)

16.3

Cash and cash equivalents at beginning of period

101.9

136.9

Cash and cash equivalents at end of period

$ 48.8

$ 153.2

[1]	Amortization of deferred finance costs of $0.3 million (2016 - $0.2 million) are included in depreciation and amortization in the consolidated statement of cash flow but in interest expense in the consolidated statement of income.

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Cash Flows [Abstract]
Amortization of deferred finance costs	$ 0.3	$ 0.2

Consolidated Statement of Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2016	$ 653.8	$ 0.3	$ 315.1	$ (97.5)	$ 561.8	$ (126.2)	$ 0.3
Net income	43.3				43.3
Dividend paid	(9.2)				(9.2)
Non-controlling interest	0.1						0.1
Changes in cumulative translation adjustment, net of tax	12.6					12.6
Treasury stock reissued	1.0		(0.4)	1.4
Treasury stock repurchased	(1.0)			(1.0)
Stock option compensation	2.2		2.2
Amortization of prior service credit, net of tax	(0.4)					(0.4)
Amortization of actuarial net losses, net of tax	2.0					2.0
Ending Balance at Jun. 30, 2017	$ 704.4	$ 0.3	$ 316.9	$ (97.1)	$ 595.9	$ (112.0)	$ 0.4

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	*NOTE 1 – BASIS OF PRESENTATION* The accompanying unaudited interim consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X under the Securities Exchange Act of 1934. Accordingly, they do not include all the information and notes necessary for a comprehensive presentation of financial position, results of operations and cash flows. It is our opinion, however, that all adjustments (consisting of normal, recurring adjustments, unless otherwise disclosed) have been made which are necessary for the financial statements to be fairly stated. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K filed on February 15, 2017. The results for the interim period covered by this report are not necessarily indicative of the results to be expected for the full year. When we use the terms “Innospec,” “the Corporation,” “the Company,” “Registrant,” “we,” “us” and “our,” we are referring to Innospec Inc. and its consolidated subsidiaries unless otherwise indicated or the context otherwise requires.

Segment Reporting

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Reporting

NOTE 2 – SEGMENT REPORTING

The Company reports its financial performance based on the four reportable segments Fuel Specialties, Performance Chemicals, Oilfield Services and Octane Additives.

The Fuel Specialties, Performance Chemicals and Oilfield Services segments operate in markets where we actively seek growth opportunities although their ultimate customers are different. The Octane Additives segment is expected to decline in the near future as our one remaining refinery customer transitions to unleaded fuel.

The Company evaluates the performance of its segments based on operating income. The following tables analyze sales and other financial information by the Company’s reportable segments:


	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2017		2016		2017		2016
Net Sales:
Refinery and Performance	$	88.7	$	93.7	$	189.1	$	192.0
Other		32.6		35.6		58.6		60.7

Fuel Specialties		121.3		129.3		247.7		252.7

Personal Care		48.6		31.8		96.1		64.0
Home Care		29.4		0.6		56.3		0.9
Other		26.9		2.9		47.0		5.1

Performance Chemicals		104.9		35.3		199.4		70.0
Oilfield Services		76.1		46.5		142.6		82.7
Octane Additives		24.0		16.9		30.9		34.7

	$	326.3	$	228.0	$	620.6	$	440.1


	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2017			2016			2017			2016
Net sales:
Fuel Specialties	$	121.3		$	129.3		$	247.7		$	252.7
Performance Chemicals		104.9			35.3			199.4			70.0
Oilfield Services		76.1			46.5			142.6			82.7
Octane Additives		24.0			16.9			30.9			34.7

	$	326.3		$	228.0		$	620.6		$	440.1

Gross profit:
Fuel Specialties	$	45.2		$	43.7		$	91.3		$	85.7
Performance Chemicals		17.4			11.3			34.1			22.1
Oilfield Services		29.0			19.9			54.4			31.5
Octane Additives		13.5			10.6			16.2			22.4

	$	105.1		$	85.5		$	196.0		$	161.7

Operating income:
Fuel Specialties	$	23.8		$	24.2		$	50.6		$	48.1
Performance Chemicals		6.5			4.7			12.5			9.1
Oilfield Services		3.7			(1.6	)		6.7			(7.1	)
Octane Additives		12.8			9.6			14.8			20.6
Pension credit		1.0			1.7			2.1			3.5
Corporate costs		(12.1	)		(12.4	)		(22.8	)		(22.6	)
Adjustment to fair value of contingent consideration		0.0			2.4			0.0			4.0
Loss on disposal of subsidiary		(1.0	)		0.0			(1.0	)		(1.4	)
Foreign exchange loss on liquidation of subsidiary		0.0			0.0			(1.8	)		0.0

Total operating income	$	34.7		$	28.6		$	61.1		$	54.2

The pension credit relates to the United Kingdom defined benefit pension plan which is closed to future service accrual. The charges related to our other much smaller pension arrangements in the U.S. and overseas are included in the segment and income statement captions consistent with the related employees’ costs.

The following table presents a summary of the depreciation and amortization charges incurred by the Company’s reportable segments:


	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2017		2016		2017		2016
Depreciation:
Fuel Specialties	$	1.0	$	1.0	$	2.0	$	1.9
Performance Chemicals		2.3		0.6		4.5		1.1
Oilfield Services		1.6		1.5		3.2		2.9
Octane Additives		0.2		0.2		0.4		0.3
Corporate		0.2		0.2		0.4		0.4

	$	5.3	$	3.5	$	10.5	$	6.6

Amortization:
Fuel Specialties	$	0.2	$	0.3	$	0.4	$	0.5
Performance Chemicals		1.8		1.0		3.7		2.0
Oilfield Services		3.0		3.0		6.0		6.0
Corporate		1.8		1.8		3.6		3.6

	$	6.8	$	6.1	$	13.7	$	12.1

Earnings Per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Earnings Per Share

NOTE 3 – EARNINGS PER SHARE

Basic earnings per share is based on the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period. Per share amounts are computed as follows:


	Three Months Ended June 30				Six Months Ended June 30
	2017		2016		2017		2016
Numerator (in millions):
Net income available to common stockholders	$	26.1	$	28.9	$	43.3	$	47.8

Denominator (in thousands):
Weighted average common shares outstanding		24,133		23,973		24,110		23,996
Dilutive effect of stock options and awards		422		470		448		466

Denominator for diluted earnings per share		24,555		24,443		24,558		24,462

Net income per share, basic:	$	1.08	$	1.21	$	1.80	$	1.99

Net income per share, diluted:	$	1.06	$	1.18	$	1.76	$	1.95

In the three and six months ended June 30, 2017, the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 18,843 and 18,843, respectively (three and six months ended June 30, 2016 – 471 and 471 respectively).

Goodwill

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

NOTE 4 – GOODWILL

The following table summarizes goodwill at the balance sheet dates:


(in millions)	December 31, 2016			Movement in the period			June 30, 2017
Gross cost ⁽¹⁾	$	611.3		$	(39.3	)	$	572.0
Accumulated impairment losses		(236.5	)		0.0			(236.5	)

Net book amount	$	374.8		$	(39.3	)	$	335.5

⁽¹⁾	Gross cost for 2017 and 2016 is net of $298.5 million of historical accumulated amortization.

Acquisition of Huntsman European Differentiated Surfactants Business

On December 30, 2016 the Company acquired the European Differentiated Surfactants business (“Huntsman”) from Huntsman Investments (Netherlands) B.V.. We purchased the business for total consideration of $199.2 million subject to working capital adjustments.

The measurement period for the valuation of assets acquired and liabilities assumed ends as soon as information on the facts and circumstances that existed as of the acquisition dates become available but does not exceed twelve months. During the three months ended March 31, 2017, we have reviewed the fair values of assets acquired and liabilities assumed in the acquisition of Huntsman, resulting in a $39.3 million increase in assets acquired and a corresponding decrease in goodwill. The following table summarizes the calculations of the total purchase price and the provisional allocation of the purchase price to assets and liabilities assumed for the business:


(in millions)	Huntsman
Goodwill	$	68.1
Other intangible assets		33.5
Fixed assets		92.7
Other net assets acquired		4.9

Purchase price, net of cash acquired	$	199.2

The final purchase price, including working capital adjustments, and fair value review of assets and liabilities acquired has not been finalized as at June 30, 2017.

Huntsman, and the associated goodwill and other intangible assets, are included within our Performance Chemicals segment for management and reporting purposes. There is currently no goodwill amortizable for tax purposes.

Other Intangible Assets

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

NOTE 5 – OTHER INTANGIBLE ASSETS

The following table summarizes the other intangible assets movement year on year:


	Six Months Ended June 30
(in millions)	2017			2016
Gross cost at January 1	$	248.6		$	248.6
Acquisitions		33.5			0.0
Exchange effect		(0.1	)		0.0

Gross cost at June 30		282.0			248.6

Accumulated amortization at January 1		(104.2	)		(79.9	)
Amortization expense		(13.7	)		(12.1	)
Exchange effect		0.0			0.0

Accumulated amortization at June 30		(117.9	)		(92.0	)

Net book amount at June 30	$	164.1		$	156.6

Acquisitions in the year relate to the allocation of goodwill from the Huntsman acquisition based on our provisional assessment of the fair value of the other intangible assets acquired. These intangible assets relate to customer relationships.

Amortization expense


	Six Months Ended June 30
(in millions)	2017			2016
Product rights	$	(1.9	)	$	(1.9	)
Brand names		(0.6	)		(0.6	)
Technology		(1.7	)		(1.7	)
Customer relationships		(5.1	)		(3.4	)
Non-compete agreements		(0.4	)		(0.5	)
Marketing related		(0.4	)		(0.4	)
Internally developed software		(3.6	)		(3.6	)

Total	$	(13.7	)	$	(12.1	)

Pension Plans

6 Months Ended

Jun. 30, 2017

Retirement Benefits [Abstract]

Pension Plans

NOTE 6 – PENSION PLANS

The Company maintains a defined benefit pension plan (the “Plan”) covering a number of its current and former employees in the United Kingdom, although it does also have other much smaller pension arrangements in the U.S. and overseas. The Plan is closed to future service accrual but has a large number of deferred and current pensioners.


	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2017			2016			2017			2016
Plan net pension credit/(charge):
Service cost	$	(0.3	)	$	(0.3	)	$	(0.5	)	$	(0.5	)
Interest cost on projected benefit obligation		(3.7	)		(5.6	)		(7.4	)		(11.0	)
Expected return on plan assets		6.1			8.0			12.0			15.8
Amortization of prior service credit		0.2			0.3			0.5			0.6
Amortization of actuarial net losses		(1.3	)		(0.7	)		(2.5	)		(1.4	)

	$	1.0		$	1.7		$	2.1		$	3.5

The amortization of prior service credit and actuarial net losses is a reclassification out of accumulated other comprehensive loss into selling, general and administrative expenses.

The Company also maintains an unfunded defined benefit pension plan covering a number of its current and former employees in Germany (the “German plan”). The German plan is closed to new entrants and has no assets. The net pension charge for the German plan for the three and six months ended June 30, 2017 was $0.2 million and $0.4 million, respectively (three and six months ended June 30, 2016—$0.2 million and $0.4 million, respectively).

As at June 30, 2017, our Performance Chemicals segment has pension obligations in its European businesses with a liability of $4.5 million (December 31, 2016—$4.1 million).

Income Taxes

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 7 – INCOME TAXES

A roll-forward of unrecognized tax benefits and associated accrued interest and penalties is as follows:


(in millions)	Unrecognized Tax Benefits		Interest and Penalties		Total
Opening balance at January 1, 2017	$	2.2	$	0.1	$	2.3
Adjustment for prior period tax positions		0.0		0.0		0.0

Closing balance at June 30, 2017		2.2		0.1		2.3
Current		0.0		0.0		0.0

Non-current	$	2.2	$	0.1	$	2.3

All of the unrecognized tax benefits, interest and penalties would impact our effective tax rate if recognized.

We recognize accrued interest and penalties associated with uncertain tax positions as part of income taxes in our consolidated statements of income.

The Company or one of its subsidiaries files income tax returns with the U.S. federal government, and various state and foreign jurisdictions. As previously disclosed, one of the Company’s U.S. subsidiaries is currently subject to a state tax examination in respect of 2012 through to 2014 inclusive. The Company and its U.S. subsidiaries received notification in May 2017, of a federal income tax examination by the IRS for 2015. The Company currently anticipates that adjustments, if any, arising out of these tax audits would not result in a material change to the Company’s financial position as at June 30, 2017.

The Company and its U.S. subsidiaries remain open to examination by the IRS for years 2013 onwards. The Company’s subsidiaries in foreign tax jurisdictions are open to examination including France (2013 onwards), Germany (2015 onwards), Switzerland (2015 onwards) and the United Kingdom (2015 onwards).

The Company is in a position to control whether or not to repatriate foreign earnings and we currently do not expect to make a repatriation in the foreseeable future. No taxes have been provided for on the unremitted earnings of our overseas subsidiaries as any tax basis differences relating to investments in these overseas subsidiaries are considered to be indefinite in duration. The amount of unremitted earnings at December 31, 2016 was approximately $788 million. If these earnings are remitted, additional taxes could result after offsetting foreign income taxes paid although the calculation of the additional taxes is not practicable to compute at this time.

Long-Term Debt

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 8 – LONG-TERM DEBT

Long-term debt consists of the following:


(in millions)	June 30, 2017			December 31, 2016
Revolving credit facility	$	141.0		$	161.0
Term loan		110.0			110.0
Deferred finance costs		(1.9	)		(2.2	)

	$	249.1		$	268.8
Due within one year		(10.3	)		(10.3	)

Due after one year	$	238.8		$	258.5

Plant Closure Provisions

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Plant Closure Provisions

NOTE 9 – PLANT CLOSURE PROVISIONS

The liability for estimated closure costs of Innospec’s manufacturing facilities includes costs for decontamination and environmental remediation activities (“remediation”). The principal site giving rise to remediation liabilities is the manufacturing site at Ellesmere Port in the United Kingdom. There are also remediation liabilities on a much smaller scale in respect of our other manufacturing sites in the U.S. and Europe.

Movements in the provisions are summarized as follows:


	Six Months Ended June 30
(in millions)	2017			2016
Total at January 1	$	39.5		$	37.7
Charge for the period		2.9			2.4
Utilized in the period		(1.0	)		(1.5	)
Exchange effect		0.3			0.0

Total at June 30		41.7			38.6
Due within one year		(6.1	)		(5.7	)

Due after one year	$	35.6		$	32.9

Amounts due within one year refer to provisions where expenditure is expected to arise within one year of the balance sheet date.

Fair Value Measurements

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

NOTE 10 – FAIR VALUE MEASUREMENTS

The following table presents the carrying amount and fair values of the Company’s assets and liabilities measured on a recurring basis:


	June 30, 2017				December 31, 2016
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Non-derivatives:
Cash and cash equivalents	$	48.8	$	48.8	$	101.9	$	101.9
Derivatives (Level 1 measurement):
Other non-current assets:
Interest rate swaps		0.4		0.4		0.4		0.4
Liabilities
Non-derivatives:
Long-term debt (including current portion)	$	249.1	$	249.1	$	268.8	$	268.8
Finance leases (including current portion)		5.8		5.8		4.5		4.5
Derivatives (Level 1 measurement):
Other non-current liabilities:
Foreign currency forward exchange contracts		0.0		0.0		0.6		0.6
Non-financial liabilities (Level 3 measurement):
Stock equivalent units		10.6		10.6		9.8		9.8

The following methods and assumptions were used to estimate the fair values of financial instruments:

Cash and cash equivalents: The carrying amount approximates fair value because of the short-term maturities of such instruments.

Long-term debt and finance leases: Long-term debt principally comprises the term loan and revolving credit facility, which are shown net of deferred finance costs that have been capitalized. The fair value of long-term debt approximates to the carrying value, as the discounting to its present value is offset by the payments under the interest rate swaps. Finance leases relate to certain fixed assets in our oilfield services business. The carrying amount of finance leases approximates to the fair value.

Derivatives: The fair value of derivatives relating to interest rate swaps and foreign currency forward exchange contracts are derived from current settlement prices and comparable contracts using current assumptions. Interest rate swaps relate to contracts taken out to hedge interest rate risk on a portion of our long-term debt. Foreign currency forward exchange contracts primarily relate to contracts entered into to hedge future known transactions or hedge balance sheet net cash positions. The movements in the carrying amounts and fair values of these contracts are largely due to changes in exchange rates against the U.S. dollar and changes in U.S. LIBOR.

Stock equivalent units: The fair values of stock equivalent units are calculated at each balance sheet date using either the Black-Scholes or Monte Carlo method depending on the terms of each grant.

Derivative Instruments and Risk Management	6 Months Ended
Derivative Instruments and Risk Management	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Risk Management	*NOTE 11 – DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT* The Company enters into various foreign currency forward exchange contracts to minimize currency exchange rate exposure from expected future cash flows. As at June 30, 2017 the contracts have maturity dates of up to eighteen months at the date of inception. These foreign currency forward exchange contracts have not been designated as hedging instruments, and their impact on the income statement for the first six months of 2017 was a loss of $0.6 million (first six months of 2016: gain of $3.0 million). The Company enters into interest rate swaps to minimize interest rate exposure related to a part of our borrowing requirements. These interest rate swaps have been designated as hedging instruments, and their impact on accumulated other comprehensive loss for the first six months of 2017 was a gain of $0.0 million (first six months of 2016: $0.0 million).

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	*NOTE 12 – COMMITMENTS AND CONTINGENCIES* Legal matters While we are involved from time to time in claims and legal proceedings that result from, and are incidental to, the conduct of our business including business and commercial litigation, employee and product liability claims, there are no material pending legal proceedings to which the Company or any of its subsidiaries is a party, or of which any of their property is subject. It is possible, however, that an adverse resolution of an unexpectedly large number of such individual claims or proceedings could in the aggregate have a material adverse effect on the results of operations for a particular year or quarter. Guarantees The Company and certain of the Company’s consolidated subsidiaries are contingently liable for certain obligations of affiliated companies primarily in the form of guarantees of debt and performance under contracts entered into as a normal business practice. This includes guarantees of non-U.S. excise taxes and customs duties. As at June 30, 2017, such guarantees which are not recognized as liabilities in the consolidated financial statements amounted to $5.7 million. Under the terms of the guarantee arrangements, generally the Company would be required to perform should the affiliated company fail to fulfil its obligations under the arrangements. In some cases, the guarantee arrangements have recourse provisions that would enable the Company to recover any payments made under the terms of the guarantees from securities held of the guaranteed parties’ assets. The Company and its affiliates have numerous long-term sales and purchase commitments in their various business activities, which are expected to be fulfilled with no adverse consequences material to the Company.

Stock-Based Compensation Plans

6 Months Ended

Jun. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation Plans

NOTE 13 – STOCK-BASED COMPENSATION PLANS

The Company grants stock options and stock equivalent units (“SEUs”) from time to time as a long-term performance incentive. In certain cases the grants are subject to performance conditions such as the Company’s stock price. Where performance conditions apply the Monte Carlo simulation model is used to determine the fair values. Otherwise the Black-Scholes model is used to determine the fair values.

Stock option plans

The following table summarizes the transactions of the Company’s stock option plans for the six months ended June 30, 2017:


	Number of Options			Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2016		570,994		$	20.38	$	21.68
Granted - at discount		79,664		$	0.00	$	61.39
- at market value		18,843		$	70.60	$	16.84
Exercised		(82,323	)	$	12.36	$	24.01
Forfeited		(3,427	)	$	14.91	$	22.84

Outstanding at June 30, 2017		583,751		$	20.65	$	26.65

At June 30, 2017, there were 44,543 stock options that were exercisable, of which 9,421 had performance conditions attached.

The stock option compensation cost for the first six months of 2017 was $2.2 million (2016 – $1.9 million). The total intrinsic value of options exercised in the first six months of 2017 was $2.0 million (2016 – $1.6 million).

The total compensation cost related to non-vested stock options not yet recognized at June 30, 2017 was $7.9 million and this cost is expected to be recognized over the weighted-average period of 2.21 years.

Stock equivalent units

The following table summarizes the transactions of the Company’s SEUs for the six months ended June 30, 2017:


	Number of SEUs			Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2016		279,815		$	3.77	$	33.40
Granted - at discount		180,249		$	0.00	$	62.76
- at market value		5,530		$	70.60	$	16.84
Exercised		(33,104	)	$	5.63	$	26.94
Forfeited		(12,775	)	$	0.00	$	32.94

Outstanding at June 30, 2017		419,715		$	3.00	$	46.31

At June 30, 2017 there were 54,509 SEUs that are exercisable, of which 49,141 had performance conditions attached.

The charges for SEUs are spread over the life of the award subject to a revaluation to fair value each quarter. The revaluation may result in a charge or a credit to the income statement in the quarter dependent upon our share price and other performance criteria.

The SEU compensation cost for the first six months of 2017 was $2.5 million (2016 – $0.0 million). The total intrinsic value of SEUs exercised in the first six months of 2017 was $1.1 million (2016 - $1.2 million).

The weighted-average remaining vesting period of non-vested SEUs is 2.14 years.

Reclassifications out of Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Reclassifications out of Accumulated Other Comprehensive Loss

NOTE 14 – RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS

Reclassifications out of accumulated other comprehensive loss for the first six months of 2017 were:


(in millions) Details about AOCL Components	Amount Reclassified from AOCL			Affected Line Item in the Statement where Net Income is Presented
Foreign currency translation items:
Liquidation of subsidiary	$	1.8		Loss on liquidation of subsidiary
Defined benefit pension plan items:
Amortization of prior service credit	$	(0.5	)	See ⁽¹⁾ below
Amortization of actuarial net losses		2.5		See ⁽¹⁾ below

		3.8		Total before tax
		(0.4	)	Income tax expense

Total reclassifications	$	3.4		Net of tax

⁽¹⁾These items are included in the computation of net periodic pension cost. See Note 6 of the Notes to the Consolidated Financial Statements for additional information.

Changes in accumulated other comprehensive loss for the first six months of 2017, net of tax, were:


(in millions)	Derivative instruments		Defined Benefit Pension Plan Items			Cumulative Translation Adjustments			Total
Balance at December 31, 2016	$	0.3	$	(46.0	)	$	(80.5	)	$	(126.2	)

Other comprehensive income before reclassifications		0.0		0.0			12.6			12.6
Amounts reclassified from AOCL		0.0		1.6			0.0			1.6

Total other comprehensive income		0.0		1.6			12.6			14.2

Balance at June 30, 2017	$	0.3	$	(44.4	)	$	(67.9	)	$	(112.0	)

Recently Issued Accounting Pronouncements	6 Months Ended
Recently Issued Accounting Pronouncements	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	*NOTE 15 – RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS* In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. ASU 2017-07 requires companies to present the service cost component of net benefit cost in the same line items in which they report compensation cost. Companies will present all other components of net benefit cost outside operating income, if this subtotal is presented. The new standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company has not yet determined the effect of the standard on its ongoing financial reporting. In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, Revision to Lease Accounting, which amends ASC Topic 842, Leases. The ASU requires lessees to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. The Company has not yet determined the effect of the standard on its ongoing financial reporting. In May 2014, the FASB issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers ASC Topic 606, which amends the existing accounting standards for revenue recognition. ASU 2014-09 is based on principles that govern the recognition of revenue at an amount an entity expects to be entitled when products are transferred to customers. The original effective date for ASU 2014-09 was for annual and interim periods within those years beginning after December 15, 2016. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers – Deferral of the Effective Date, which defers the effective date of ASU 2014-09 for one year and permits early adoption as early as the original effective date of ASU 2014-09. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. We expect to adopt the new revenue standard on January 1, 2018 and continue to evaluate whether we will adopt the standard retrospectively or as a cumulative effect adjustment. We expect to continue the evaluation, analysis and documentation of ASU 2014-09 (including those subsequently issued updates that clarify its positions) throughout most of this year as we work towards the implementation and finalize the impact the adoption will have on our consolidated financial statements.

Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	*NOTE 16 – RELATED PARTY TRANSACTIONS* Mr. Robert I. Paller has been a non-executive director of the Company since November 1, 2009. The Company has retained and continues to retain Smith, Gambrell & Russell, LLP (“SGR”), a law firm with which Mr. Paller holds a position. In the first six months of 2017 the Company incurred fees from SGR of $0.2 million (2016 – $0.4 million). As at June 30, 2017, the amount due to SGR from the Company was $0.0 million (December 31, 2016 – $0.0 million).

Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Reporting

The following tables analyze sales and other financial information by the Company’s reportable segments:


	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2017		2016		2017		2016
Net Sales:
Refinery and Performance	$	88.7	$	93.7	$	189.1	$	192.0
Other		32.6		35.6		58.6		60.7

Fuel Specialties		121.3		129.3		247.7		252.7

Personal Care		48.6		31.8		96.1		64.0
Home Care		29.4		0.6		56.3		0.9
Other		26.9		2.9		47.0		5.1

Performance Chemicals		104.9		35.3		199.4		70.0
Oilfield Services		76.1		46.5		142.6		82.7
Octane Additives		24.0		16.9		30.9		34.7

	$	326.3	$	228.0	$	620.6	$	440.1


	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2017			2016			2017			2016
Net sales:
Fuel Specialties	$	121.3		$	129.3		$	247.7		$	252.7
Performance Chemicals		104.9			35.3			199.4			70.0
Oilfield Services		76.1			46.5			142.6			82.7
Octane Additives		24.0			16.9			30.9			34.7

	$	326.3		$	228.0		$	620.6		$	440.1

Gross profit:
Fuel Specialties	$	45.2		$	43.7		$	91.3		$	85.7
Performance Chemicals		17.4			11.3			34.1			22.1
Oilfield Services		29.0			19.9			54.4			31.5
Octane Additives		13.5			10.6			16.2			22.4

	$	105.1		$	85.5		$	196.0		$	161.7

Operating income:
Fuel Specialties	$	23.8		$	24.2		$	50.6		$	48.1
Performance Chemicals		6.5			4.7			12.5			9.1
Oilfield Services		3.7			(1.6	)		6.7			(7.1	)
Octane Additives		12.8			9.6			14.8			20.6
Pension credit		1.0			1.7			2.1			3.5
Corporate costs		(12.1	)		(12.4	)		(22.8	)		(22.6	)
Adjustment to fair value of contingent consideration		0.0			2.4			0.0			4.0
Loss on disposal of subsidiary		(1.0	)		0.0			(1.0	)		(1.4	)
Foreign exchange loss on liquidation of subsidiary		0.0			0.0			(1.8	)		0.0

Total operating income	$	34.7		$	28.6		$	61.1		$	54.2

Summary of Segment Depreciation and Amortization

The following table presents a summary of the depreciation and amortization charges incurred by the Company’s reportable segments:


	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2017		2016		2017		2016
Depreciation:
Fuel Specialties	$	1.0	$	1.0	$	2.0	$	1.9
Performance Chemicals		2.3		0.6		4.5		1.1
Oilfield Services		1.6		1.5		3.2		2.9
Octane Additives		0.2		0.2		0.4		0.3
Corporate		0.2		0.2		0.4		0.4

	$	5.3	$	3.5	$	10.5	$	6.6

Amortization:
Fuel Specialties	$	0.2	$	0.3	$	0.4	$	0.5
Performance Chemicals		1.8		1.0		3.7		2.0
Oilfield Services		3.0		3.0		6.0		6.0
Corporate		1.8		1.8		3.6		3.6

	$	6.8	$	6.1	$	13.7	$	12.1

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Summary of Earnings Per Share

Per share amounts are computed as follows:


	Three Months Ended June 30				Six Months Ended June 30
	2017		2016		2017		2016
Numerator (in millions):
Net income available to common stockholders	$	26.1	$	28.9	$	43.3	$	47.8

Denominator (in thousands):
Weighted average common shares outstanding		24,133		23,973		24,110		23,996
Dilutive effect of stock options and awards		422		470		448		466

Denominator for diluted earnings per share		24,555		24,443		24,558		24,462

Net income per share, basic:	$	1.08	$	1.21	$	1.80	$	1.99

Net income per share, diluted:	$	1.06	$	1.18	$	1.76	$	1.95

Goodwill (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill

The following table summarizes goodwill at the balance sheet dates:


(in millions)	December 31, 2016			Movement in the period			June 30, 2017
Gross cost ⁽¹⁾	$	611.3		$	(39.3	)	$	572.0
Accumulated impairment losses		(236.5	)		0.0			(236.5	)

Net book amount	$	374.8		$	(39.3	)	$	335.5

⁽¹⁾	Gross cost for 2017 and 2016 is net of $298.5 million of historical accumulated amortization.

Schedule of Total Purchase Price and Provisional Allocation of Purchase Price to Assets and Liabilities Assumed

The following table summarizes the calculations of the total purchase price and the provisional allocation of the purchase price to assets and liabilities assumed for the business:


(in millions)	Huntsman
Goodwill	$	68.1
Other intangible assets		33.5
Fixed assets		92.7
Other net assets acquired		4.9

Purchase price, net of cash acquired	$	199.2

Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Other Intangible Assets

The following table summarizes the other intangible assets movement year on year:


	Six Months Ended June 30
(in millions)	2017			2016
Gross cost at January 1	$	248.6		$	248.6
Acquisitions		33.5			0.0
Exchange effect		(0.1	)		0.0

Gross cost at June 30		282.0			248.6

Accumulated amortization at January 1		(104.2	)		(79.9	)
Amortization expense		(13.7	)		(12.1	)
Exchange effect		0.0			0.0

Accumulated amortization at June 30		(117.9	)		(92.0	)

Net book amount at June 30	$	164.1		$	156.6

Schedule of Amortization Expense

Amortization expense


	Six Months Ended June 30
(in millions)	2017			2016
Product rights	$	(1.9	)	$	(1.9	)
Brand names		(0.6	)		(0.6	)
Technology		(1.7	)		(1.7	)
Customer relationships		(5.1	)		(3.4	)
Non-compete agreements		(0.4	)		(0.5	)
Marketing related		(0.4	)		(0.4	)
Internally developed software		(3.6	)		(3.6	)

Total	$	(13.7	)	$	(12.1	)

Pension Plans (Tables)

6 Months Ended

Jun. 30, 2017

Retirement Benefits [Abstract]

Defined Benefit Pension Plan


	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2017			2016			2017			2016
Plan net pension credit/(charge):
Service cost	$	(0.3	)	$	(0.3	)	$	(0.5	)	$	(0.5	)
Interest cost on projected benefit obligation		(3.7	)		(5.6	)		(7.4	)		(11.0	)
Expected return on plan assets		6.1			8.0			12.0			15.8
Amortization of prior service credit		0.2			0.3			0.5			0.6
Amortization of actuarial net losses		(1.3	)		(0.7	)		(2.5	)		(1.4	)

	$	1.0		$	1.7		$	2.1		$	3.5

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties

A roll-forward of unrecognized tax benefits and associated accrued interest and penalties is as follows:


(in millions)	Unrecognized Tax Benefits		Interest and Penalties		Total
Opening balance at January 1, 2017	$	2.2	$	0.1	$	2.3
Adjustment for prior period tax positions		0.0		0.0		0.0

Closing balance at June 30, 2017		2.2		0.1		2.3
Current		0.0		0.0		0.0

Non-current	$	2.2	$	0.1	$	2.3

Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt consists of the following:


(in millions)	June 30, 2017			December 31, 2016
Revolving credit facility	$	141.0		$	161.0
Term loan		110.0			110.0
Deferred finance costs		(1.9	)		(2.2	)

	$	249.1		$	268.8
Due within one year		(10.3	)		(10.3	)

Due after one year	$	238.8		$	258.5

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Plant Closure Provisions (Tables)

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Movements in Plant Closure and Restructuring Provisions

Movements in the provisions are summarized as follows:


	Six Months Ended June 30
(in millions)	2017			2016
Total at January 1	$	39.5		$	37.7
Charge for the period		2.9			2.4
Utilized in the period		(1.0	)		(1.5	)
Exchange effect		0.3			0.0

Total at June 30		41.7			38.6
Due within one year		(6.1	)		(5.7	)

Due after one year	$	35.6		$	32.9

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis

The following table presents the carrying amount and fair values of the Company’s assets and liabilities measured on a recurring basis:


	June 30, 2017				December 31, 2016
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Non-derivatives:
Cash and cash equivalents	$	48.8	$	48.8	$	101.9	$	101.9
Derivatives (Level 1 measurement):
Other non-current assets:
Interest rate swaps		0.4		0.4		0.4		0.4
Liabilities
Non-derivatives:
Long-term debt (including current portion)	$	249.1	$	249.1	$	268.8	$	268.8
Finance leases (including current portion)		5.8		5.8		4.5		4.5
Derivatives (Level 1 measurement):
Other non-current liabilities:
Foreign currency forward exchange contracts		0.0		0.0		0.6		0.6
Non-financial liabilities (Level 3 measurement):
Stock equivalent units		10.6		10.6		9.8		9.8

Stock-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2017

Stock Options Plan [Member]

Summary of Transactions of Company's Stock Option Plans

The following table summarizes the transactions of the Company’s stock option plans for the six months ended June 30, 2017:


	Number of Options			Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2016		570,994		$	20.38	$	21.68
Granted - at discount		79,664		$	0.00	$	61.39
- at market value		18,843		$	70.60	$	16.84
Exercised		(82,323	)	$	12.36	$	24.01
Forfeited		(3,427	)	$	14.91	$	22.84

Outstanding at June 30, 2017		583,751		$	20.65	$	26.65

Stock Equivalent Units [Member]

Summarizes Transactions of SEUs

The following table summarizes the transactions of the Company’s SEUs for the six months ended June 30, 2017:


	Number of SEUs			Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2016		279,815		$	3.77	$	33.40
Granted - at discount		180,249		$	0.00	$	62.76
- at market value		5,530		$	70.60	$	16.84
Exercised		(33,104	)	$	5.63	$	26.94
Forfeited		(12,775	)	$	0.00	$	32.94

Outstanding at June 30, 2017		419,715		$	3.00	$	46.31

Reclassifications out of Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Summary of Reclassifications Out of Accumulated Other Comprehensive Loss

Reclassifications out of accumulated other comprehensive loss for the first six months of 2017 were:


(in millions) Details about AOCL Components	Amount Reclassified from AOCL			Affected Line Item in the Statement where Net Income is Presented
Foreign currency translation items:
Liquidation of subsidiary	$	1.8		Loss on liquidation of subsidiary
Defined benefit pension plan items:
Amortization of prior service credit	$	(0.5	)	See ⁽¹⁾ below
Amortization of actuarial net losses		2.5		See ⁽¹⁾ below

		3.8		Total before tax
		(0.4	)	Income tax expense

Total reclassifications	$	3.4		Net of tax

⁽¹⁾These items are included in the computation of net periodic pension cost. See Note 6 of the Notes to the Consolidated Financial Statements for additional information.

Changes in Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss for the first six months of 2017, net of tax, were:


(in millions)	Derivative instruments		Defined Benefit Pension Plan Items			Cumulative Translation Adjustments			Total
Balance at December 31, 2016	$	0.3	$	(46.0	)	$	(80.5	)	$	(126.2	)

Other comprehensive income before reclassifications		0.0		0.0			12.6			12.6
Amounts reclassified from AOCL		0.0		1.6			0.0			1.6

Total other comprehensive income		0.0		1.6			12.6			14.2

Balance at June 30, 2017	$	0.3	$	(44.4	)	$	(67.9	)	$	(112.0	)

Segment Reporting - Additional Information (Detail)	6 Months Ended
Segment Reporting - Additional Information (Detail)	Jun. 30, 2017 Segment
Segment Reporting [Abstract]
Number of reportable segments	4

Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 326.3	$ 228.0	$ 620.6	$ 440.1
Gross profit	105.1	85.5	196.0	161.7
Adjustment to fair value of contingent consideration	0.0	2.4	0.0	4.0
Loss on disposal of subsidiary	(1.0)	0.0	(1.0)	(1.4)
Foreign exchange loss on liquidation of subsidiary	0.0	0.0	(1.8)	0.0
Operating income	34.7	28.6	61.1	54.2
Operating Segments [Member] \| Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	121.3	129.3	247.7	252.7
Gross profit	45.2	43.7	91.3	85.7
Operating income	23.8	24.2	50.6	48.1
Operating Segments [Member] \| Fuel Specialties [Member] \| Refinery and Performance [Member]
Segment Reporting Information [Line Items]
Net sales	88.7	93.7	189.1	192.0
Operating Segments [Member] \| Fuel Specialties [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Net sales	32.6	35.6	58.6	60.7
Operating Segments [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	104.9	35.3	199.4	70.0
Gross profit	17.4	11.3	34.1	22.1
Operating income	6.5	4.7	12.5	9.1
Operating Segments [Member] \| Performance Chemicals [Member] \| Personal Care [Member]
Segment Reporting Information [Line Items]
Net sales	48.6	31.8	96.1	64.0
Operating Segments [Member] \| Performance Chemicals [Member] \| Home Care [Member]
Segment Reporting Information [Line Items]
Net sales	29.4	0.6	56.3	0.9
Operating Segments [Member] \| Performance Chemicals [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Net sales	26.9	2.9	47.0	5.1
Operating Segments [Member] \| Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	76.1	46.5	142.6	82.7
Gross profit	29.0	19.9	54.4	31.5
Operating income	3.7	(1.6)	6.7	(7.1)
Operating Segments [Member] \| Octane Additives [Member]
Segment Reporting Information [Line Items]
Net sales	24.0	16.9	30.9	34.7
Gross profit	13.5	10.6	16.2	22.4
Operating income	12.8	9.6	14.8	20.6
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Pension credit	1.0	1.7	2.1	3.5
Corporate costs	(12.1)	(12.4)	(22.8)	(22.6)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Loss on disposal of subsidiary	$ (1.0)	$ 0.0	$ (1.0)	$ (1.4)

Segment Reporting - Summary of Segment Depreciation and Amortization (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summary of segment depreciation and amortization
Depreciation	$ 5.3	$ 3.5	$ 10.5	$ 6.6
Amortization	6.8	6.1	13.7	12.1
Operating Segments [Member] \| Fuel Specialties [Member]
Summary of segment depreciation and amortization
Depreciation	1.0	1.0	2.0	1.9
Amortization	0.2	0.3	0.4	0.5
Operating Segments [Member] \| Performance Chemicals [Member]
Summary of segment depreciation and amortization
Depreciation	2.3	0.6	4.5	1.1
Amortization	1.8	1.0	3.7	2.0
Operating Segments [Member] \| Oilfield Services [Member]
Summary of segment depreciation and amortization
Depreciation	1.6	1.5	3.2	2.9
Amortization	3.0	3.0	6.0	6.0
Operating Segments [Member] \| Octane Additives [Member]
Summary of segment depreciation and amortization
Depreciation	0.2	0.2	0.4	0.3
Corporate, Non-Segment [Member]
Summary of segment depreciation and amortization
Depreciation	0.2	0.2	0.4	0.4
Amortization	$ 1.8	$ 1.8	$ 3.6	$ 3.6

Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator (in millions):
Net income available to common stockholders	$ 26.1	$ 28.9	$ 43.3	$ 47.8
Denominator (in thousands):
Weighted average common shares outstanding	24,133	23,973	24,110	23,996
Dilutive effect of stock options and awards	422	470	448	466
Denominator for diluted earnings per share	24,555	24,443	24,558	24,462
Net income per share, basic:	$ 1.08	$ 1.21	$ 1.80	$ 1.99
Net income per share, diluted:	$ 1.06	$ 1.18	$ 1.76	$ 1.95

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Average number of anti-dilutive options excluded from the calculation of diluted earnings per share	18,843	471	18,843	471

Goodwill - Summary of Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost, beginning balance	$ 611.3
Movement in the period	(39.3)
Gross cost, ending balance	572.0
Accumulated impairment losses	(236.5)	$ (236.5)
Net book amount, beginning balance	374.8
Movement in the period	(39.3)
Net book amount, ending balance	$ 335.5

Goodwill - Summary of Goodwill (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Historical accumulated amortization	$ 298.5	$ 298.5

Goodwill - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended
Goodwill - Additional Information (Detail) - USD ($)	Dec. 30, 2016	Mar. 31, 2017	Jun. 30, 2017
Goodwill [Line Items]
Decrease in goodwill			$ 39,300,000
Huntsman [Member]
Goodwill [Line Items]
Business acquisition, consideration transferred	$ 199,200,000
Decrease in goodwill		$ 39,300,000
Goodwill amortizable for tax purpose			$ 0

Goodwill - Schedule of Total Purchase Price and Provisional Allocation of Purchase Price to Assets and Liabilities Assumed (Detail) - USD ($) $ in Millions		6 Months Ended
	Dec. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Purchase price, net of cash acquired		$ 0.0	$ (1.8)
Huntsman [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired	$ 199.2
Huntsman [Member] \| Other Intangible Assets [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired	33.5
Huntsman [Member] \| Goodwill [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired	68.1
Huntsman [Member] \| Fixed Assets [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired	92.7
Huntsman [Member] \| Other Net Assets Acquired [Member]
Business Acquisition [Line Items]
Purchase price, net of cash acquired	$ 4.9

Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 248.6	$ 248.6
Acquisitions			33.5	0.0
Exchange effect			(0.1)	0.0
Gross cost at June 30	$ 282.0	$ 248.6	282.0	248.6
Accumulated amortization at January 1			(104.2)	(79.9)
Amortization expense	(6.8)	(6.1)	(13.7)	(12.1)
Exchange effect			0.0	0.0
Accumulated amortization at June 30	(117.9)	(92.0)	(117.9)	(92.0)
Net book amount at June 30	$ 164.1	$ 156.6	$ 164.1	$ 156.6	$ 144.4

Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ (6.8)	$ (6.1)	$ (13.7)	$ (12.1)
Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			(1.9)	(1.9)
Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			(0.6)	(0.6)
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			(1.7)	(1.7)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			(5.1)	(3.4)
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			(0.4)	(0.5)
Marketing Related [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			(0.4)	(0.4)
Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			$ (3.6)	$ (3.6)

Pension Plans - Plan Net Pension Credit (Detail) - United Kingdom [Member] - Foreign Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Plan net pension credit/(charge):
Service cost	$ (0.3)	$ (0.3)	$ (0.5)	$ (0.5)
Interest cost on projected benefit obligation	(3.7)	(5.6)	(7.4)	(11.0)
Expected return on plan assets	6.1	8.0	12.0	15.8
Amortization of prior service credit	0.2	0.3	0.5	0.6
Amortization of actuarial net losses	(1.3)	(0.7)	(2.5)	(1.4)
Net pension credit total	$ 1.0	$ 1.7	$ 2.1	$ 3.5

Pension Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension obligations European businesses	$ 15.7		$ 15.7		$ 14.2
Germany [Member] \| Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension charge	0.2	$ 0.2	0.4	$ 0.4
Europe [Member] \| Foreign Pension Plan [Member] \| Performance Chemicals [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension obligations European businesses	$ 4.5		$ 4.5		$ 4.1

Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Opening balance at January 1	$ 2.3
Adjustment for prior period tax positions	0.0
Closing balance at June 30	2.3
Current	0.0
Non-current	2.3	$ 2.3
Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Opening balance at January 1	2.2
Adjustment for prior period tax positions	0.0
Closing balance at June 30	2.2
Current	0.0
Non-current	2.2
Interest and Penalties [Member]
Income Tax Contingency [Line Items]
Opening balance at January 1	0.1
Adjustment for prior period tax positions	0.0
Closing balance at June 30	0.1
Current	0.0
Non-current	$ 0.1

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Income tax examination, description	The Company and its U.S. subsidiaries remain open to examination by the IRS for years 2013 onwards. The Company's subsidiaries in foreign tax jurisdictions are open to examination including France (2013 onwards), Germany (2015 onwards), Switzerland (2015 onwards) and the United Kingdom (2015 onwards).
Unremitted earnings		$ 788
France [Member]
Income Tax Contingency [Line Items]
Open tax year	2013
Germany [Member]
Income Tax Contingency [Line Items]
Open tax year	2015
Switzerland [Member]
Income Tax Contingency [Line Items]
Open tax year	2015
United Kingdom [Member]
Income Tax Contingency [Line Items]
Open tax year	2015

Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Deferred finance costs	$ (1.9)	$ (2.2)
Long-term debt	249.1	268.8
Due within one year	(10.3)	(10.3)
Due after one year	238.8	258.5
Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	110.0	110.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 141.0	$ 161.0

Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Beginning Balance	$ 39.5	$ 37.7
Charge for the period	2.9	2.4
Utilized in the period	(1.0)	(1.5)
Exchange effect	0.3	0.0
Ending Balance	41.7	38.6
Due within one year	(6.1)	(5.7)	$ (6.7)
Due after one year	$ 35.6	$ 32.9	$ 32.8

Fair Value Measurements - Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Carrying Amount [Member]
Non-derivatives:
Cash and cash equivalents	$ 48.8	$ 101.9
Non-derivatives:
Long-term debt (including current portion)	249.1	268.8
Finance leases (including current portion)	5.8	4.5
Carrying Amount [Member] \| Derivatives (Level 1 Measurement) [Member] \| Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Interest rate swaps	0.4	0.4
Carrying Amount [Member] \| Derivatives (Level 1 Measurement) [Member] \| Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.6
Carrying Amount [Member] \| Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	10.6	9.8
Fair Value [Member]
Non-derivatives:
Cash and cash equivalents	48.8	101.9
Non-derivatives:
Long-term debt (including current portion)	249.1	268.8
Finance leases (including current portion)	5.8	4.5
Fair Value [Member] \| Derivatives (Level 1 Measurement) [Member] \| Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Interest rate swaps	0.4	0.4
Fair Value [Member] \| Derivatives (Level 1 Measurement) [Member] \| Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.6
Fair Value [Member] \| Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	$ 10.6	$ 9.8

Derivative Instruments and Risk Management - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Maximum [Member]
Derivative [Line Items]
Maturity period of foreign currency forward exchange contracts	18 months
Not Designated as Hedging Instrument [Member] \| Foreign Currency Forward Exchange Contracts [Member] \| Other net income/(expense) [Member]
Derivative [Line Items]
Amount of gain/(loss) recognized in income	$ 0.6	$ 3.0
Designated as Hedging Instrument [Member] \| Interest Rate Swaps [Member] \| Accumulated Other Comprehensive Loss [Member]
Derivative [Line Items]
Amount of gain/(loss) recognized in income	$ 0.0	$ 0.0

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Jun. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Guarantees	$ 5.7

Stock-Based Compensation Plans - Summary of Transactions of the Company's Stock Option Plans (Detail) - Stock Options Plan [Member]	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Options, Beginning balance \| shares	570,994
Exercised, Number of Options \| shares	(82,323)
Forfeited, Number of Options \| shares	(3,427)
Outstanding, Number of Options, Ending balance \| shares	583,751
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 20.38
Exercised, Weighted Average Exercise Price	12.36
Forfeited, Weighted Average Exercise Price	14.91
Outstanding, Weighted Average Exercise Price, Ending balance	20.65
Outstanding, Weighted Average Grant-Date Fair Value	21.68
Exercised	24.01
Forfeited, Weighted Average Grant-Date Fair Value	22.84
Outstanding, Weighted Average Grant-Date Fair Value	$ 26.65
Discount [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Options \| shares	79,664
Granted, Weighted Average Exercise Price	$ 0.00
Granted, Weighted Average Grant-Date Fair Value	$ 61.39
Market Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Options \| shares	18,843
Granted, Weighted Average Exercise Price	$ 70.60
Granted, Weighted Average Grant-Date Fair Value	$ 16.84

Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation	$ 2.2	$ 1.9
Stock Options Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number exercisable and fully vested	44,543
Fully vested stock options with performance conditions attached	9,421
Stock option compensation	$ 2.2	1.9
Total intrinsic value exercised	2.0	1.6
Total compensation cost related to non-vested stock options not yet recognized	$ 7.9
Expected compensation cost recognized over the weighted-average period	2 years 2 months 16 days
Stock Equivalent Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fully vested stock options with performance conditions attached	49,141
Total intrinsic value exercised	$ 1.1	1.2
Expected compensation cost recognized over the weighted-average period	2 years 1 month 20 days
Number of exercisable SEUs	54,509
Compensation cost	$ 2.5	$ 0.0

Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) - Stock Equivalent Units [Member]	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 3.77
Granted at discount, Weighted Average Exercise Price	0.00
Granted at market value, Weighted Average Exercise Price	70.60
Exercised, Weighted Average Exercise Price	5.63
Forfeited, Weighted Average Exercise Price	0.00
Outstanding, Weighted Average Exercise Price, Ending balance	$ 3.00
Outstanding, Number of SEUs, Beginning balance \| shares	279,815
Granted at discount, Number of SEUs \| shares	180,249
Granted at market value, Number of SEUs \| shares	5,530
Exercised, Number of SEUs \| shares	(33,104)
Forfeited, Number of SEUs \| shares	(12,775)
Outstanding, Number of SEUs, Ending balance \| shares	419,715
Outstanding, Weighted Average Grant-Date Fair Value	$ 33.40
Granted at discount, Weighted Average Grant-Date Fair Value	62.76
Granted at market value, Weighted Average Grant-Date Fair Value	16.84
Exercised, Weighted Average Grant-Date Fair Value	26.94
Forfeited, Weighted Average Grant-Date Fair Value	32.94
Outstanding, Weighted Average Grant-Date Fair Value	$ 46.31

Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Liquidation of subsidiary	$ 0.0	$ 0.0	$ 1.8	$ 0.0
Total reclassifications			(1.6)
Foreign Currency Translation Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications			0.0
Defined Benefit Pension Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications			(1.6)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax			3.8
Income tax expense			(0.4)
Total reclassifications			3.4
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] \| Foreign Currency Translation Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Liquidation of subsidiary			1.8
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] \| Defined Benefit Pension Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit			(0.5)
Amortization of actuarial net losses			$ 2.5

Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 653.5
Other comprehensive income before reclassifications			12.6
Amounts reclassified from AOCL			1.6
Total other comprehensive income/(loss)	$ 9.7	$ (1.5)	14.2	$ 0.4
Ending Balance	704.0		704.0
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(126.2)
Ending Balance	(112.0)		(112.0)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			0.3
Other comprehensive income before reclassifications			0.0
Amounts reclassified from AOCL			0.0
Total other comprehensive income/(loss)			0.0
Ending Balance	0.3		0.3
Defined Benefit Pension Plan Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(46.0)
Other comprehensive income before reclassifications			0.0
Amounts reclassified from AOCL			1.6
Total other comprehensive income/(loss)			1.6
Ending Balance	(44.4)		(44.4)
Foreign Currency Translation Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(80.5)
Other comprehensive income before reclassifications			12.6
Amounts reclassified from AOCL			0.0
Total other comprehensive income/(loss)			12.6
Ending Balance	$ (67.9)		$ (67.9)

Related Party Transactions - Additional Information (Detail) - Smith, Gambrell & Russell, LLP [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Related Party Transaction [Line Items]
Fees payable to Smith, Gambrell & Russell	$ 0.2		$ 0.4
Amount due to Smith, Gambrell & Russell	$ 0.0	$ 0.0