Segment Reporting and Geographical Area Data (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Segment Reporting

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

(in millions)	2025			2024			2023
Net Sales:
Personal Care	$	409.2		$	390.0		$	352.7
Home Care		109.0			106.6			86.8
Other		163.2			157.1			122.1
Performance Chemicals		681.4			653.7			561.6
Refinery and Performance		509.4			517.4			540.6
Other		192.1			183.7			155.3
Fuel Specialties		701.5			701.1			695.9
Oilfield Services		395.1			490.6			691.3
Total net sales	$	1,778.0		$	1,845.4		$	1,948.8
Gross profit:
Performance Chemicals		122.0			148.4			105.6
Fuel Specialties		252.2			239.9			215.1
Oilfield Services		118.2			154.6			270.4
Total gross profit	$	492.4		$	542.9		$	591.1
Operating income/(expense):
Performance Chemicals	$	61.0		$	82.9		$	54.5
Fuel Specialties		144.8			129.6			109.7
Oilfield Services		23.3			38.8			78.6
Corporate costs		(72.8	)		(70.2	)		(81.2	)
Adjustment to fair value of contingent consideration		15.9			(3.4	)		—
Restructuring charge		(0.9	)		—			—
Impairment of property, plant and equipment		(22.9	)		—			—
Impairment of intangible assets		(19.1	)		—			—
Profit on disposal of property, plant and equipment		0.2			0.2			—
Total operating income	$	129.5		$	177.9		$	161.6
Identifiable assets at year-end:
Performance Chemicals	$	602.0		$	598.3
Fuel Specialties		625.5			553.8
Oilfield Services		212.2			272.5
Corporate		392.7			310.1
Total assets	$	1,832.4		$	1,734.7

Summary of Segment Reporting related to Cost of Goods Sold

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

(in millions)	2025		2024		2023
Performance Chemicals	$	559.4	$	505.3	$	456.0
Fuel Specialties		449.3		461.2		480.8
Oilfield Services		276.9		336.0		420.9
Total cost of goods sold	$	1,285.6	$	1,302.5	$	1,357.7

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:

(in millions)	2025		2024		2023
Performance Chemicals	$	61.0	$	65.5	$	51.1
Fuel Specialties		107.4		110.3		105.4
Oilfield Services		94.9		115.8		191.8
Corporate		72.8		70.2		81.2
Total selling, general and administrative expenses and research and development expenses	$	336.1	$	361.8	$	429.5

Summary of Segment Depreciation and Amortization

The following tables analyze sales and other financial information by location:

(in millions)	2025			2024			2023
Net sales by source:
United States	$	951.7		$	1,039.7		$	1,227.2
United Kingdom		793.2			823.4			857.7
Rest of World		379.0			288.9			199.4
Sales between areas		(345.9	)		(306.6	)		(335.5	)
	$	1,778.0		$	1,845.4		$	1,948.8
Income before income taxes:
United States	$	25.9		$	90.2		$	95.2
United Kingdom		67.3			(24.6	)		59.1
Rest of World		44.9			(24.4	)		20.1
	$	138.1		$	41.2		$	174.4
Long-lived assets at year-end:
United States	$	132.6		$	156.2
United Kingdom		121.3			88.0
Rest of World		150.4			133.6
	$	404.3		$	377.8
Identifiable assets at year-end:
United States	$	555.9		$	593.6
United Kingdom		579.1			488.2
Rest of World		298.4			270.4
Goodwill		399.0			382.5
	$	1,832.4		$	1,734.7