Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 1,483.4	$ 1,193.1	$ 1,513.3
Gross profit/(loss)	434.9	342.7	466.2
Restructuring charge	0.0	(21.3)	0.0
Impairment of intangible assets	0.0	(19.8)	0.0
Profit on disposal	1.8	0.0	0.0
Operating income/(expense)	132.1	33.7	149.9
Identifiable assets at year end	1,570.9	1,397.4	1,468.8
Operating Segments [Member] | Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	618.3	512.7	583.7
Gross profit/(loss)	193.2	160.3	204.5
Operating income/(expense)	104.6	84.5	116.6
Identifiable assets at year end	571.3	509.7	499.7
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]
Segment Reporting Information [Line Items]
Net sales	445.3	372.9	427.9
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	173.0	139.8	155.8
Operating Segments [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	525.3	425.4	428.7
Gross profit/(loss)	125.2	103.8	100.1
Operating income/(expense)	70.9	54.8	48.7
Identifiable assets at year end	469.5	391.5	383.3
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]
Segment Reporting Information [Line Items]
Net sales	296.1	231.4	228.0
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]
Segment Reporting Information [Line Items]
Net sales	93.0	87.0	93.4
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	136.2	107.0	107.3
Operating Segments [Member] | Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	339.8	255.0	479.9
Gross profit/(loss)	116.5	80.8	159.9
Operating income/(expense)	10.4	(9.5)	39.7
Identifiable assets at year end	230.8	210.8	316.8
Operating Segments [Member] | Octane Additives [Member]
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	21.0
Gross profit/(loss)	0.0	(2.2)	1.7
Operating income/(expense)	0.0	(2.8)	(0.7)
Identifiable assets at year end	0.0	0.0	24.2
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate costs	(55.6)	(52.2)	(54.4)
Restructuring charge	0.0	(21.3)	0.0
Impairment of intangible assets	0.0	(19.8)	0.0
Profit on disposal	1.8	0.0	0.0
Identifiable assets at year end	$ 299.3	$ 285.4	$ 244.8