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Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 354.5	$ 244.9	$ 694.1	$ 617.2
Gross profit/(loss)	108.3	59.1	209.1	173.0
Restructuring charge	(0.0)	(21.1)	(0.0)	(21.1)
Impairment of intangible assets	(0.0)	(19.8)	(0.0)	(19.8)
Operating income/(loss)	37.0	(53.4)	65.2	(12.5)
Operating Segments [Member] | Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	143.1	107.4	282.4	254.4
Gross profit/(loss)	50.1	25.4	95.0	76.6
Operating income/(loss)	28.5	4.7	52.3	36.8
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]
Segment Reporting Information [Line Items]
Net sales	94.8	74.9	194.1	183.5
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	48.3	32.5	88.3	70.9
Operating Segments [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	128.2	95.7	254.1	208.8
Gross profit/(loss)	31.6	24.9	63.0	52.5
Operating income/(loss)	17.9	12.2	36.2	27.8
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]
Segment Reporting Information [Line Items]
Net sales	73.8	49.8	142.0	112.8
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]
Segment Reporting Information [Line Items]
Net sales	21.3	21.3	44.3	42.9
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	33.1	24.6	67.8	53.1
Operating Segments [Member] | Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	83.2	41.8	157.6	154.0
Gross profit/(loss)	26.6	9.9	51.1	46.1
Operating income/(loss)	2.2	(12.4)	3.4	(5.2)
Operating Segments [Member] | Octane Additives [Member]
Segment Reporting Information [Line Items]
Gross profit/(loss)	0.0	(1.1)	0.0	(2.2)
Operating income/(loss)	0.0	(1.6)	0.0	(2.8)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate costs	$ (11.6)	$ (15.4)	$ (26.7)	$ (28.2)

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