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Long-Term Debt - Additional Information (Detail) - Revolving Credit Facility [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Due date of revolving credit	May 30, 2028
Line of credit facility, maximum borrowing capacity	$ 250.0
Line of credit facility cumulative drawn down	0.0		$ 0.0
Repayment on credit facility	$ 0.0	$ 0.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Pay vs Performance Disclosure
Net Income (Loss)	$ 30.4	$ 32.8

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Restructuring and Related Activities [Abstract]
Beginning Balance	$ 65.2
Charge for the period	2.3
Utilized in the period	(0.8)
Exchange effect	(1.0)
Ending Balance	65.7
Due within one year	(4.9)	$ (4.9)
Due after one year	$ 60.8	$ 60.2

Other Intangible Assets

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

NOTE 5 – OTHER INTANGIBLE ASSETS

The following table analyzes other intangible assets movements in the year:


(in millions)	2026
Gross cost at January 1	$	373.3
Additions		5.1
Exchange effect		(2.1	)
Gross cost at March 31		376.3
Accumulated amortization at January 1		(305.6	)
Amortization expense		(2.6	)
Exchange effect		0.8
Accumulated amortization at March 31		(307.4	)
Net book amount at March 31		68.9

The amortization expense for the three months ended March 31, 2026 was $2.6 million (three months ended March 31, 2025 – $2.7 million).

In 2026, we have capitalized $5.1 million in relation to the development of our internal-use software for a new Enterprise Resource Planning (“ERP”) system across all our regions. The project is now substantially complete. The expenses capitalized include the acquisition costs for the software as well as the external consultancy costs and the internal employee costs relating to software development.

Related Party Transactions

3 Months Ended

Mar. 31, 2026

Related Party Transactions

NOTE 16 – RELATED PARTY TRANSACTIONS

Mr. David F. Landless has been a non-executive director of the Company since January 1, 2016 and is a non-executive director of Ausurus Group Limited which owns European Metal Recycling Limited (“EMR”) which from time to time purchases scrap metal from the Company. The Company has sold less than $0.1 million of scrap metal to EMR in the three months ended March 31, 2026 (three months ended March 31, 2025 nil). A tendering process is operated periodically to select the best buyer for the sale of scrap metal by the Company. As at March 31, 2026, EMR owed nil for scrap metal purchased from the Company (December 31, 2025 nil).

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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+ Details

Pension and Post-Employment Benefits (Tables)

3 Months Ended

Mar. 31, 2026

Plan Net Pension Credit

The net periodic benefit/(cost) is shown in the following table:


	Three Months Ended March 31,
(in millions)	2026			2025
Service credit/(cost)	$	—		$	(1.2	)
Interest cost on projected benefit obligation		(0.1	)		(0.1	)
Net periodic benefit/(cost)	$	(0.1	)	$	(1.3	)

Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 2.6	$ 2.7
Intangible asset capitalized		$ 5.1
Software Development [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset capitalized	$ 5.1

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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+ Details

Segment Reporting - Additional Information (Detail)	3 Months Ended
Segment Reporting - Additional Information (Detail)	Mar. 31, 2026 Segment
Number of reportable segments	3
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	President And Chief Executive Officer [Member]
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM evaluates the performance of the Company’s segments and makes strategic decisions relating to the Company's allocation of resources, based on the segments' gross profit and operating income.

Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator (in millions):
Net Income (Loss)	$ 30.4	$ 32.8
Denominator (in thousands):
Weighted average common shares outstanding	24,776	24,970
Dilutive effect of stock options and awards	68	132
Denominator for diluted earnings per share	24,844	25,102
Earnings per share, basic:	$ 1.23	$ 1.31
Earnings per share, diluted:	$ 1.22	$ 1.31

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Segment Reporting - Summary of Segment Reporting related to Cost of Goods Sold (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total cost of goods sold	$ 329.7	$ 315.7
Operating Segments [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Total cost of goods sold	141.0	133.1
Operating Segments [Member] \| Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Total cost of goods sold	117.3	109.5
Operating Segments [Member] \| Oilfield Services [Member]
Segment Reporting Information [Line Items]
Total cost of goods sold	$ 71.4	$ 73.1

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References + Details

Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Net sales	$ 453.2	$ 440.8
Gross profit	123.5	125.1
Adjustment to fair value of contingent consideration	4.7	(0.7)
Profit on disposal of property, plant and equipment	0.0	0.1
Operating income/(loss)	36.5	42.5
Operating Segments [Member]
Segment Reporting Information [Line Items]
Adjustment to fair value of contingent consideration	4.7	(0.7)
Profit on disposal of property, plant and equipment	0.0	0.1
Operating Segments [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	169.4	168.4
Gross profit	28.4	35.3
Operating income/(loss)	10.7	19.8
Operating Segments [Member] \| Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	181.6	170.3
Gross profit	64.3	60.8
Operating income/(loss)	37.8	36.9
Operating Segments [Member] \| Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	102.2	102.1
Gross profit	30.8	29.0
Operating income/(loss)	5.6	4.1
Operating Segments [Member] \| Personal Care [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	97.1	100.6
Operating Segments [Member] \| Home Care [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	30.8	26.3
Operating Segments [Member] \| Other [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	41.5	41.5
Operating Segments [Member] \| Refinery and Performance [Member] \| Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	130.9	129.4
Operating Segments [Member] \| Other [Member] \| Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	50.7	40.9
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate costs	$ (22.3)	$ (17.7)

Basis of Presentation

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

NOTE 1 – BASIS OF PRESENTATION

The accompanying unaudited interim condensed 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 a fair statement of the condensed consolidated financial statements. These condensed consolidated 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 for the year ended December 31, 2025, filed on February 18, 2026 (the “2025 Form 10-K”).

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,” “the Group,” “we,” “us” and “our,” we are referring to Innospec Inc. and its consolidated subsidiaries unless otherwise indicated or the context otherwise requires.

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

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 financial assets and liabilities measured on a recurring basis:


	March 31, 2026				December 31, 2025
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Derivatives (Level 1 measurement):
Other current and non-current assets:
Emissions Trading Scheme credits		1.9		1.9		3.2		3.2
Foreign currency forward exchange contracts		4.2		4.2		3.4		3.4
Liabilities
Non-financial liabilities (Level 3 measurement):
Acquisition-related contingent consideration		4.0		4.0		8.3		8.3

Goodwill - Summary of Goodwill (Detail) $ in Millions	3 Months Ended
Goodwill - Summary of Goodwill (Detail) $ in Millions	Mar. 31, 2026 USD ($)
Goodwill [Line Items]
Gross cost, beginning balance	$ 399.0
Gross cost, ending balance	399.1
Performance Chemicals [Member]
Goodwill [Line Items]
Exchange effects	0.1
Fuel Specialties [Member]
Goodwill [Line Items]
Exchange effects	$ 0.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2026	Jan. 01, 2026
Income Tax Disclosure [Abstract]
Unrecognized tax benefit		$ 0
Change in unrecognized tax benefits	$ 0
Uncertain tax positions	0
Unrecognized tax benefits interest or penalties	$ 0

Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Other Intangible Assets

The following table analyzes other intangible assets movements in the year:


(in millions)	2026
Gross cost at January 1	$	373.3
Additions		5.1
Exchange effect		(2.1	)
Gross cost at March 31		376.3
Accumulated amortization at January 1		(305.6	)
Amortization expense		(2.6	)
Exchange effect		0.8
Accumulated amortization at March 31		(307.4	)
Net book amount at March 31		68.9

Recently Issued Accounting Pronouncements

3 Months Ended

Mar. 31, 2026

Accounting Changes and Error Corrections [Abstract]

Recently Issued Accounting Pronouncements

NOTE 15 – RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

There have been no recently issued accounting pronouncements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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+ Details

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Average number of anti-dilutive options excluded from the calculation of diluted earnings per share	23,519	10,342

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	Mar. 31, 2026	Dec. 31, 2025
Carrying Amount [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Emission Trading Scheme Credits [Member]
Derivatives (Level 1 measurement):
Derivatives asset	$ 1.9	$ 3.2
Carrying Amount [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivatives asset	4.2	3.4
Carrying Amount [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Acquisition-related contingent consideration	4.0	8.3
Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Emission Trading Scheme Credits [Member]
Derivatives (Level 1 measurement):
Derivatives asset	1.9	3.2
Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivatives asset	4.2	3.4
Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Acquisition-related contingent consideration	$ 4.0	$ 8.3

Long-Term Debt

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 8 – LONG-TERM DEBT

As at March 31, 2026, and December 31, 2025, the Company had not drawn down on its revolving credit facility. During the three months ended March 31, 2026 and 2025, the Company did not draw down or repay any borrowing on its revolving credit facility.

The Company continues to have available a $250.0 million multicurrency revolving credit facility until May 30, 2028.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Pension and Post-Employment Benefits - Plan Net Pension Credit (Detail) - GERMANY - German Plan [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]
Service credit/(cost)	$ 0.0	$ (1.2)
Interest cost on projected benefit obligation	(0.1)	(0.1)
Net periodic benefit/(cost)	$ (0.1)	$ (1.3)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Stock-Based Compensation Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of stock options granted	200.00%
Total compensation cost related to non-vested stock options not yet recognized	$ 28.3
Expected compensation cost recognized over the weighted-average period	2 years 3 months 18 days

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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	Mar. 31, 2026	Mar. 31, 2025
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Accumulated Other Comprehensive Income (Loss) [Line Items]
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Derivative Instruments and Risk Management - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
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	$ 1.9	$ (2.3)

Income Taxes

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 7 – INCOME TAXES

As of January 1, 2026, the Company had no unrecognized tax benefits, and there has been no change in unrecognized tax benefits during the three months ended March 31, 2026. Accordingly, there was no accrual for uncertain tax positions as of March 31, 2026, and the Company recorded no associated interest or penalties. The Company does not expect any significant changes to this position over the next twelve months.

As of March 31, 2026, the Company and its U.S. subsidiaries remain open to examination by the IRS for years 2022 onwards under the statute of limitations. The Company’s subsidiaries in foreign tax jurisdictions are open to examination including Brazil (2021 onwards), Germany (2021 onwards), and the U.K. (2024 onwards).

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+ Details

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2026	Apr. 30, 2026
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2026
Entity File Number	1-13879
Entity Registrant Name	INNOSPEC INC.
Entity Central Index Key	0001054905
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-0181725
City Area Code	303
Entity Address, Postal Zip Code	80112
Local Phone Number	792 5554
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common stock
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,631,047
Entity Address, Address Line One	8310 South Valley Highway
Entity Address, Address Line Two	Suite 350
Entity Address, City or Town	Englewood
Entity Address, State or Province	CO
Trading Symbol	IOSP
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes

Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Increase to the provisions for legacy operations	$ 1.4
Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Accretion expense recognized	$ 2.3	$ 0.8

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Fair Value Measurements

3 Months Ended

Mar. 31, 2026

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 financial assets and liabilities measured on a recurring basis:


	March 31, 2026				December 31, 2025
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Derivatives (Level 1 measurement):
Other current and non-current assets:
Emissions Trading Scheme credits		1.9		1.9		3.2		3.2
Foreign currency forward exchange contracts		4.2		4.2		3.4		3.4
Liabilities
Non-financial liabilities (Level 3 measurement):
Acquisition-related contingent consideration		4.0		4.0		8.3		8.3

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

Emissions Trading Scheme credits: The fair value is determined by the open market pricing at the end of the reporting period.

Foreign currency forward exchange contracts: The fair value of derivatives relating to foreign currency forward exchange contracts are derived from current settlement prices and comparable contracts using current assumptions. 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.

Acquisition-related contingent consideration: Contingent consideration payable in cash is discounted to its fair value at each balance sheet date. Where contingent consideration is dependent upon pre-determined financial targets, an estimate of the fair value of the likely consideration payable is made at each balance sheet date. The contingent consideration payable has been calculated based on the latest forecast. The movement in the current year relates to a $4.9 million reduction in the fair value of the expected payable relating to the acquisition of QGP Química Geral (“QGP”), partially offset by an accretion charge of $0.2 million and the impact of foreign exchange of $0.4 million.

Fair Value Measurements - Additional Information (Details) - Quimica Geral S A [Member] $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reduction in the fair value of the expected payable	$ 4.9
Accretion charge	0.2
Acquisition related impact of foreign exchange	$ 0.4

Reclassifications Out of Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Reclassifications out of Accumulated Other Comprehensive Loss

NOTE 14 – RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS

There were no reclassifications out of accumulated other comprehensive loss (“AOCL”) for the three months ended March 31, 2026.

Changes in AOCL for the three months ended March 31, 2026, net of tax, were:


(in millions)	Defined Benefit Pension Plan Items		Cumulative Translation Adjustments			Total
Balance at December 31, 2025	$	0.9	$	(35.6	)	$	(34.7	)
Other comprehensive income/(loss) before reclassifications		—		(6.1	)		(6.1	)
Amounts reclassified from AOCL		—		—			—
Total other comprehensive income/(loss)		—		(6.1	)		(6.1	)
Balance at March 31, 2026	$	0.9	$	(41.7	)	$	(40.8	)

There were no reclassifications out of AOCL for the three months ended March 31, 2025.

Changes in AOCL for the three months ended March 31, 2025, net of tax, were:


(in millions)	Defined Benefit Pension Plan Items		Cumulative Translation Adjustments			Total
Balance at December 31, 2024	$	—	$	(91.0	)	$	(91.0	)
Other comprehensive income/(loss) before reclassifications		—		18.7			18.7
Amounts reclassified from AOCL		—		—			—
Total other comprehensive income/(loss)		—		18.7			18.7
Balance at March 31, 2025	$	—	$	(72.3	)	$	(72.3	)

Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Gross cost at January 1	$ 373.3
Additions		$ 5.1
Exchange effect		(2.1)
Gross cost at March 31		376.3
Accumulated amortization at January 1	(305.6)
Amortization expense	(2.6)	$ (2.7)
Exchange effect	0.8
Accumulated amortization at March 31	(307.4)
Net book amount at March 31	$ 68.9		$ 67.7

- Definition

+ References

+ Details

Pension and Post-Employment Benefits - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Defined Benefit Plan Disclosure [Line Items]
Post-employment obligations European businesses	$ 9.1	$ 9.4
Europe [Member]
Defined Benefit Plan Disclosure [Line Items]
Post-employment obligations European businesses	$ 3.7	$ 3.8

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Derivative Instruments and Risk Management

3 Months Ended

Mar. 31, 2026

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 March 31, 2026, the contracts have maturity dates of up to two years 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 three months ended March 31, 2026 was a gain of $1.9 million (three months ended March 31, 2025 a loss of $2.3 million). The gain or loss has been recorded in other income or expense.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Plant Closure Provisions (Tables)

3 Months Ended

Mar. 31, 2026

Restructuring and Related Activities [Abstract]

Movements in Plant Closure and Restructuring Provisions

Movements in the provisions are summarized as follows:


(in millions)	2026
Total at January 1	$	65.2
Charge for the period		2.3
Utilized in the period		(0.8	)
Exchange effect		(1.0	)
Total at March 31		65.7
Due within one year		(4.9	)
Due after one year	$	60.8

Earnings Per Share

3 Months Ended

Mar. 31, 2026

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 under the treasury stock method. Per share amounts are computed as follows:


	Three Months Ended March 31,
	2026		2025
Numerator (in millions):
Net income attributable to Innospec	$	30.4	$	32.8
Denominator (in thousands):
Weighted average common shares outstanding		24,776		24,970
Dilutive effect of stock options and awards		68		132
Denominator for diluted earnings per share		24,844		25,102
Earnings per share, basic:	$	1.23	$	1.31
Earnings per share, diluted:	$	1.22	$	1.31

In the three months ended March 31, 2026, the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 23,519 (three months ended March 31, 2025– 10,342).

Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Other Commitments [Line Items]
Guarantees	$ 6.1	$ 6.0
Maximum [Member]
Other Commitments [Line Items]
Fixed maturity guarantee remaining term	7 years

Stock-Based Compensation Plans - Summary of Transactions of the Company's Share Based Compensation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	$ 1.9	$ 2.1
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	1.8	1.9
Stock Equivalent Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	$ 0.1	$ 0.2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Stock-Based Compensation Plans - Summary of Transactions of the Share Based Compensation Plans (Detail)	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Share-Based Payment Arrangement, Disclosure [Abstract]
Number of shares, Begining balance \| shares	431,297
Number of shares, Granted \| shares	207,459
Number of shares, Vested \| shares	(135,600)
Number of shares, Forfeited \| shares	0
Number of shares , Ending balance \| shares	503,156
Weighted Average Grant-Date Fair Value , Begining balance \| $ / shares	$ 109.5
Weighted Average Grant-Date Fair Value, Granted \| $ / shares	76.9
Weighted Average Grant-Date Fair Value, Vested \| $ / shares	92.7
Weighted Average Grant-Date Fair Value, Forfeited \| $ / shares	0
Weighted Average Grant-Date Fair Value, Ending balance \| $ / shares	$ 100.6

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Net sales	$ 453.2	$ 440.8
Cost of goods sold	(329.7)	(315.7)
Gross profit	123.5	125.1
Operating expenses:
Selling, general and administrative	(78.5)	(69.3)
Research and development	(13.2)	(12.7)
Adjustment to fair value of contingent consideration	4.7	(0.7)
Profit on disposal of property, plant and equipment	0.0	0.1
Total operating expenses	(87.0)	(82.6)
Operating income	36.5	42.5
Other income/(expense), net	2.6	0.3
Interest income, net	0.8	2.4
Income before income tax expense	39.9	45.2
Income tax expense	(9.1)	(11.6)
Net income	30.8	33.6
Less: Net income attributable to noncontrolling interests	(0.4)	(0.8)
Net income attributable to Innospec	$ 30.4	$ 32.8
Earnings per share:
Basic	$ 1.23	$ 1.31
Diluted	$ 1.22	$ 1.31
Weighted average shares outstanding (in thousands):
Basic	24,776	24,970
Diluted	24,844	25,102

Related Party Transactions - Additional Information (Detail) - European Metal Recycling Limited [Member] - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Other Liabilities	$ 0		$ 0
Maximum [Member]
Related Party Transaction [Line Items]
Tendering process to select best buyer of scrap metal	$ 100,000	$ 0

- Definition

Amount of liabilities classified as other.

+ References

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 289.1	$ 292.5
Trade and other accounts receivable (less allowances of $14.2 million and $11.8 million respectively)	354.2	342.3
Inventories (less allowances of $39.4 million and $40.4 million respectively):
Finished goods	225.6	226.3
Raw materials	95.9	103.0
Total inventories	321.5	329.3
Prepaid expenses	16.9	20.1
Prepaid income taxes	10.6	13.1
Other current assets	6.8	7.3
Total current assets	999.1	1,004.6
Net property, plant and equipment	285.7	286.1
Operating lease right-of-use assets	50.6	52.7
Goodwill	399.1	399.0
Other intangible assets	68.9	67.7
Deferred tax assets	13.0	13.6
Other non-current assets	3.4	8.7
Total assets	1,819.8	1,832.4
Current liabilities:
Accounts payable	138.5	174.7
Accrued liabilities	169.3	152.3
Current portion of operating lease liabilities	15.1	15.9
Current portion of plant closure provisions	4.9	4.9
Current portion of acquisition-related contingent consideration	2.7	7.0
Accrued income taxes	4.3	5.3
Total current liabilities	334.8	360.1
Operating lease liabilities, net of current portion	35.5	36.8
Plant closure provisions, net of current portion	60.8	60.2
Deferred tax liabilities	17.9	19.1
Pension liabilities and post-employment benefits	12.8	13.2
Acquisition-related contingent consideration	1.3	1.3
Other non-current liabilities	4.5	8.8
Total liabilities	467.6	499.5
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	377.3	376.5
Treasury stock (4,836,364 and 4,776,918 shares at cost, respectively)	(121.4)	(115.2)
Retained earnings	1,129.6	1,099.2
Accumulated other comprehensive loss	(40.8)	(34.7)
Total Innospec stockholders' equity	1,345.0	1,326.1
Non-controlling interest	7.2	6.8
Total equity	1,352.2	1,332.9
Total liabilities and equity	$ 1,819.8	$ 1,832.4

Pension and Post-Employment Benefits

3 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Pension and Post-Employment Benefits

NOTE 6 – PENSION AND POST EMPLOYMENT BENEFITS

The Company maintains an unfunded defined benefit pension plan covering certain current and former employees in Germany (the “German plan”). The German plan is closed to new entrants and has no assets. As at March 31, 2026, we have recorded a liability of $9.1 million (December 31, 2025 $9.4 million).

The net periodic benefit/(cost) is shown in the following table:


	Three Months Ended March 31,
(in millions)	2026			2025
Service credit/(cost)	$	—		$	(1.2	)
Interest cost on projected benefit obligation		(0.1	)		(0.1	)
Net periodic benefit/(cost)	$	(0.1	)	$	(1.3	)

The prior year includes a service cost related to the now closed United Kingdom defined benefit pension scheme. The service cost has been recognized in selling, general and administrative expenses. All other items have been recognized within other income and expense.

In addition, we have obligations for post-employment benefits in some of our other European businesses. As at March 31, 2026, we have recorded a liability of $3.7 million (December 31, 2025 $3.8 million).

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Goodwill

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

NOTE 4 – GOODWILL

The following table summarizes the goodwill movements in the year:


(in millions)	2026
Opening balance at January 1	$	399.0
Exchange effects
Performance Chemicals		0.1
Fuel Specialties		—
Closing balance at March 31	$	399.1

- Definition

The entire disclosure for goodwill.

+ References + Details

Stock-Based Compensation Plans

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation Plans

NOTE 13 – STOCK-BASED COMPENSATION PLANS

The following table summarizes the transactions of the Company’s share-based compensation for 2026 and 2025:


	Three Months Ended March 31,
(in millions)	2026		2025
Stock options	$	1.8	$	1.9
Stock equivalent units		0.1		0.2
Total	$	1.9	$	2.1

The following table summarizes the transactions of the Company’s share-based compensation plans for the three months ended March 31, 2026.


	Number of shares			Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2025		431,297		$	109.5
Granted		207,459		$	76.9
Vested		(135,600	)	$	92.7
Forfeited		—		$	—
Nonvested at March 31, 2026		503,156		$	100.6

For the awards granted with market conditions, a Monte Carlo model has been used to calculate the grant-date fair value. For all other awards granted, a fair market value methodology has been used to calculate the grant-date fair value.

The awards granted with market and non-market conditions include performance measures that can result in a maximum 200% vesting for the number of stock options granted. The predicted vesting has been reflected in the grant-date fair value calculation, but has not been reflected for the number of awards granted, as shown in the table above.

As of March 31, 2026, there was $28.3 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements. That cost is expected to be recognized over a weighted-average period of 2.3 years.

Segment Reporting - Summary of Segment Reporting related to Selling, General and Administrative Expense and Research and Development Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total selling, general and administrative expenses and research and development expenses	$ 91.7	$ 82.0
Operating Segments [Member] \| Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Total selling, general and administrative expenses and research and development expenses	17.7	15.5
Operating Segments [Member] \| Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Total selling, general and administrative expenses and research and development expenses	26.5	23.9
Operating Segments [Member] \| Oilfield Services [Member]
Segment Reporting Information [Line Items]
Total selling, general and administrative expenses and research and development expenses	25.2	24.9
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total selling, general and administrative expenses and research and development expenses	$ 22.3	$ 17.7

Reclassifications Out of Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss

Changes in AOCL for the three months ended March 31, 2026, net of tax, were:


(in millions)	Defined Benefit Pension Plan Items		Cumulative Translation Adjustments			Total
Balance at December 31, 2025	$	0.9	$	(35.6	)	$	(34.7	)
Other comprehensive income/(loss) before reclassifications		—		(6.1	)		(6.1	)
Amounts reclassified from AOCL		—		—			—
Total other comprehensive income/(loss)		—		(6.1	)		(6.1	)
Balance at March 31, 2026	$	0.9	$	(41.7	)	$	(40.8	)

Changes in AOCL for the three months ended March 31, 2025, net of tax, were:


(in millions)	Defined Benefit Pension Plan Items		Cumulative Translation Adjustments			Total
Balance at December 31, 2024	$	—	$	(91.0	)	$	(91.0	)
Other comprehensive income/(loss) before reclassifications		—		18.7			18.7
Amounts reclassified from AOCL		—		—			—
Total other comprehensive income/(loss)		—		18.7			18.7
Balance at March 31, 2025	$	—	$	(72.3	)	$	(72.3	)

Segment Reporting

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Segment Reporting

NOTE 2 – SEGMENT REPORTING

The Company reports its financial performance based on three reportable segments, which are Performance Chemicals, Fuel Specialties and Oilfield Services.

The Chief Operating Decision Maker (“CODM”) is the President and Chief Executive Officer (the Principal Executive Officer). The CODM evaluates the performance of the Company’s segments and makes strategic decisions relating to the Company's allocation of resources, based on the segments' gross profit and operating income.

The following table analyzes sales and other financial information by the Company’s reportable segments:


	Three Months Ended March 31,
(in millions)	2026			2025
Net Sales:
Personal Care	$	97.1		$	100.6
Home Care		30.8			26.3
Other		41.5			41.5
Performance Chemicals		169.4			168.4
Refinery and Performance		130.9			129.4
Other		50.7			40.9
Fuel Specialties		181.6			170.3
Oilfield Services		102.2			102.1
	$	453.2		$	440.8
Gross profit:
Performance Chemicals	$	28.4		$	35.3
Fuel Specialties		64.3			60.8
Oilfield Services		30.8			29.0
Total gross profit	$	123.5		$	125.1
Operating income/(loss):
Performance Chemicals	$	10.7		$	19.8
Fuel Specialties		37.8			36.9
Oilfield Services		5.6			4.1
Corporate costs		(22.3	)		(17.7	)
Adjustment to fair value of contingent consideration		4.7			(0.7	)
Profit on disposal of property, plant and equipment		—			0.1
Total operating income	$	36.5		$	42.5

The difference between net sales and gross profit is defined as cost of goods sold. The difference between segmental gross profit and operating income/(expense) is split between selling, general and administrative expenses and research and development expenses.

The following table analyzes cost of goods sold by the Company’s reportable segments:


	Three Months Ended March 31,
(in millions)	2026		2025
Performance Chemicals	$	141.0	$	133.1
Fuel Specialties		117.3		109.5
Oilfield Services		71.4		73.1
Total cost of goods sold	$	329.7	$	315.7

The following table analyzes selling, general and administrative expenses and research and development expenses by the Company’s reportable segments:


	Three Months Ended March 31,
(in millions)	2026		2025
Performance Chemicals	$	17.7	$	15.5
Fuel Specialties		26.5		23.9
Oilfield Services		25.2		24.9
Corporate		22.3		17.7
Total selling, general and administrative expenses and research and development expenses	$	91.7	$	82.0

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
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-Publisher FASB
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+ Details

Condensed Consolidated Statements of Equity (Unaudited) - 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, 2024	$ 1,216.1	$ 0.3	$ 369.9	$ (93.0)	$ 1,025.0	$ (91.0)	$ 4.9
Net Income (Loss)	32.8				32.8
Changes in cumulative translation adjustment, net of tax	18.7					18.7
Share of net income	0.8						0.8
Treasury stock reissued	0.2		(1.1)	1.3
Treasury stock repurchased	(4.8)			(4.8)
Stock option compensation	1.9		1.9
Ending Balance at Mar. 31, 2025	1,265.7	0.3	370.7	(96.5)	1,057.8	(72.3)	5.7
Beginning Balance at Dec. 31, 2025	1,332.9	0.3	376.5	(115.2)	1,099.2	(34.7)	6.8
Net Income (Loss)	30.4				30.4
Changes in cumulative translation adjustment, net of tax	(6.1)					(6.1)
Share of net income	0.4						0.4
Treasury stock reissued	(0.2)		(1.0)	0.8
Treasury stock repurchased	(7.0)			(7.0)
Stock option compensation	1.8		1.8
Ending Balance at Mar. 31, 2026	$ 1,352.2	$ 0.3	$ 377.3	$ (121.4)	$ 1,129.6	$ (40.8)	$ 7.2

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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+ Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash Flows from Operating Activities
Net Income (Loss)	$ 30.4	$ 32.8
Adjustments to reconcile net income attributable to Innospec to net cash provided by operating activities:
Depreciation and amortization	9.9	10.9
Adjustment to fair value of contingent consideration	(4.7)	0.7
Deferred taxes	(0.7)	(0.3)
Profit on disposal of property, plant and equipment	0.0	(0.1)
Movements on defined benefit pension plans	(0.2)	1.3
Stock option compensation	1.6	1.9
Changes in assets and liabilities, net of effects of acquired and divested companies:
Trade and other accounts receivable	(13.7)	6.6
Inventories	5.9	(6.6)
Prepaid expenses	3.2	5.4
Accounts payable and accrued liabilities	(17.7)	(27.0)
Plant closure provisions	1.5	(0.4)
Income taxes	0.4	4.3
Other assets and liabilities	1.7	(1.2)
Net cash provided by operating activities	17.6	28.3
Cash Flows from Investing Activities
Capital expenditures	(8.9)	(8.4)
Internally developed software	(5.1)	(7.2)
Proceeds on disposal of property, plant and equipment	0.3	0.1
Net cash used in investing activities	(13.7)	(15.5)
Cash Flows from Financing Activities
Non-controlling interest	0.4	0.8
Issue of treasury stock	0.1	0.2
Repurchase of common stock	(7.1)	(4.8)
Net cash used in financing activities	(6.6)	(3.8)
Effect of foreign currency exchange rate changes on cash	(0.7)	1.6
Net change in cash and cash equivalents	(3.4)	10.6
Cash and cash equivalents at beginning of period	292.5	289.2
Cash and cash equivalents at end of period	$ 289.1	$ 299.8

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 30.4	$ 32.8
Changes in cumulative translation adjustment	(5.0)	18.4
Other comprehensive income/(loss), before tax	(5.0)	18.4
Tax related to cumulative translation adjustment	(1.1)	0.3
Income tax income/(expense) related to other comprehensive income	(1.1)	0.3
Total comprehensive income attributable to Innospec	$ 24.3	$ 51.5

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Goodwill (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill

The following table summarizes the goodwill movements in the year:


(in millions)	2026
Opening balance at January 1	$	399.0
Exchange effects
Performance Chemicals		0.1
Fuel Specialties		—
Closing balance at March 31	$	399.1

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
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-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

+ Details

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Segment Reporting

The following table analyzes sales and other financial information by the Company’s reportable segments:


	Three Months Ended March 31,
(in millions)	2026			2025
Net Sales:
Personal Care	$	97.1		$	100.6
Home Care		30.8			26.3
Other		41.5			41.5
Performance Chemicals		169.4			168.4
Refinery and Performance		130.9			129.4
Other		50.7			40.9
Fuel Specialties		181.6			170.3
Oilfield Services		102.2			102.1
	$	453.2		$	440.8
Gross profit:
Performance Chemicals	$	28.4		$	35.3
Fuel Specialties		64.3			60.8
Oilfield Services		30.8			29.0
Total gross profit	$	123.5		$	125.1
Operating income/(loss):
Performance Chemicals	$	10.7		$	19.8
Fuel Specialties		37.8			36.9
Oilfield Services		5.6			4.1
Corporate costs		(22.3	)		(17.7	)
Adjustment to fair value of contingent consideration		4.7			(0.7	)
Profit on disposal of property, plant and equipment		—			0.1
Total operating income	$	36.5		$	42.5

Summary of Segment Reporting related to Cost of Goods Sold

The following table analyzes cost of goods sold by the Company’s reportable segments:


	Three Months Ended March 31,
(in millions)	2026		2025
Performance Chemicals	$	141.0	$	133.1
Fuel Specialties		117.3		109.5
Oilfield Services		71.4		73.1
Total cost of goods sold	$	329.7	$	315.7

Summary of Segment Reporting related to Selling, General and Administrative Expense and Research and Development Expense

The following table analyzes selling, general and administrative expenses and research and development expenses by the Company’s reportable segments:


	Three Months Ended March 31,
(in millions)	2026		2025
Performance Chemicals	$	17.7	$	15.5
Fuel Specialties		26.5		23.9
Oilfield Services		25.2		24.9
Corporate		22.3		17.7
Total selling, general and administrative expenses and research and development expenses	$	91.7	$	82.0

Plant Closure Provisions

3 Months Ended

Mar. 31, 2026

Restructuring and Related Activities [Abstract]

Plant Closure Provisions

NOTE 9 – PLANT CLOSURE PROVISIONS

The Company has continuing plans to remediate manufacturing facilities at sites around the world as and when those operations are expected to cease, or we are required to decommission the sites according to local laws and regulations. The liability for the estimated plant closure costs includes costs for asset retirement obligations and environmental remediation liabilities.

The principal site giving rise to asset retirement obligations is the manufacturing site at Ellesmere Port in the U.K.. There are also asset retirement obligations and environmental remediation liabilities in respect of our other manufacturing sites, which are relatively insignificant.

Movements in the provisions are summarized as follows:


(in millions)	2026
Total at January 1	$	65.2
Charge for the period		2.3
Utilized in the period		(0.8	)
Exchange effect		(1.0	)
Total at March 31		65.7
Due within one year		(4.9	)
Due after one year	$	60.8

The charge for the three months ended March 31, 2026, was $2.3 million (three months ended March 31, 2025 $0.8 million). The current year charge represents the accounting accretion and a $1.4 million increase to the provisions for legacy operations in the United Kingdom. Amounts due within one year refer to provisions where expenditure is expected to arise within one year of the balance sheet date.

Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Summary of Earnings Per Share

Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period under the treasury stock method. Per share amounts are computed as follows:


	Three Months Ended March 31,
	2026		2025
Numerator (in millions):
Net income attributable to Innospec	$	30.4	$	32.8
Denominator (in thousands):
Weighted average common shares outstanding		24,776		24,970
Dilutive effect of stock options and awards		68		132
Denominator for diluted earnings per share		24,844		25,102
Earnings per share, basic:	$	1.23	$	1.31
Earnings per share, diluted:	$	1.22	$	1.31

Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Allowances for doubtful accounts	$ 14.2	$ 11.8
Inventory allowances	$ 39.4	$ 40.4
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	4,836,364	4,776,918

Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2026

Summary of Transactions of the Company's Share Based Compensation

The following table summarizes the transactions of the Company’s share-based compensation for 2026 and 2025:


	Three Months Ended March 31,
(in millions)	2026		2025
Stock options	$	1.8	$	1.9
Stock equivalent units		0.1		0.2
Total	$	1.9	$	2.1

Employee Stock Option

Summary of Transactions of Company's Stock Option Plans

The following table summarizes the transactions of the Company’s share-based compensation plans for the three months ended March 31, 2026.


	Number of shares			Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2025		431,297		$	109.5
Granted		207,459		$	76.9
Vested		(135,600	)	$	92.7
Forfeited		—		$	—
Nonvested at March 31, 2026		503,156		$	100.6

Reclassifications Out of Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications	$ 0	$ 0

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482739/220-10-55-15

+ Details

Contingencies

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Contingencies

NOTE 12 – CONTINGENCIES

Legal matters

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, and employee and product liability claims.

As reported in our Annual Report on Form 10-K for the year ended December 31, 2023 (the “2023 Form 10-K"), we have incurred financial losses and lodged a civil and criminal legal claim related to a misappropriation of inventory in Brazil. At the time of filing, there have been no significant developments to report in relation to the claims being made. Consistent with prior quarters, a corresponding asset for the potential legal or insurance recoveries has not been recorded for the resulting financial losses arising from this matter.

In addition, unrelated to the Brazil matter, in the unlikely event there are an unexpectedly large number of individual claims or proceedings with an adverse resolution, this 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 March 31, 2026, such guarantees, which are not recognized as liabilities in the condensed consolidated financial statements, amounted to $6.1 million (December 31, 2025 $6.0 million). The remaining terms of the fixed maturity guarantees are up to 7 years, with some further guarantees having no fixed expiry date.

Under the terms of the guarantee arrangements, generally the Company would be required to perform the obligations should the affiliated company fail to fulfill 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.