Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	$ 1,948.8	$ 1,963.7	$ 1,483.4
Profit on disposal	0.0	0.0	1.8
Operating income/(expense)	161.6	187.3	132.1
Identifiable assets at year end	1,707.4	1,603.7	1,570.9
Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	265.2	222.2
Operating Segments [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	561.6	639.7	525.3
Operating income/(expense)	54.5	95.3	70.9
Identifiable assets at year end	580.1	610.4	469.5
Operating Segments [Member] | Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	695.9	730.2	618.3
Operating income/(expense)	109.7	121.7	104.6
Identifiable assets at year end	529.2	500.6	571.3
Operating Segments [Member] | Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	691.3	593.8	339.8
Operating income/(expense)	78.6	41.7	10.4
Identifiable assets at year end	310.8	297.8	230.8
Operating Segments [Member] | Personal Care [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	352.7	393.3	296.1
Operating Segments [Member] | Home Care [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	86.8	94.2	93.0
Operating Segments [Member] | Other [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	122.1	152.2	136.2
Operating Segments [Member] | Refinery and Performance [Member] | Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	540.6	552.6	445.3
Operating Segments [Member] | Other [Member] | Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	155.3	177.6	173.0
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate costs	(81.2)	(71.4)	(55.6)
Profit on disposal	0.0	0.0	1.8
Identifiable assets at year end	$ 287.3	$ 194.9	$ 299.3