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Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 467.6	$ 354.5	$ 940.0	$ 694.1
Gross profit/(loss)	139.8	108.3	279.1	209.1
Operating income/(loss)	46.3	37.0	90.6	65.2
Operating Segments [Member] | Fuel Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	176.4	143.1	368.2	282.4
Gross profit/(loss)	56.9	50.1	117.6	95.0
Operating income/(loss)	31.5	28.5	67.0	52.3
Operating Segments [Member] | Fuel Specialties [Member] | Refinery and Performance [Member]
Segment Reporting Information [Line Items]
Net sales	123.9	94.8	272.3	194.1
Operating Segments [Member] | Fuel Specialties [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	38.4	33.1	77.7	67.8
Operating Segments [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	169.0	128.2	336.1	254.1
Gross profit/(loss)	43.6	31.6	84.4	63.0
Operating income/(loss)	28.8	17.9	54.1	36.2
Operating Segments [Member] | Performance Chemicals [Member] | Personal Care [Member]
Segment Reporting Information [Line Items]
Net sales	105.3	73.8	208.7	142.0
Operating Segments [Member] | Performance Chemicals [Member] | Home Care [Member]
Segment Reporting Information [Line Items]
Net sales	25.3	21.3	49.7	44.3
Operating Segments [Member] | Performance Chemicals [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	52.5	48.3	95.9	88.3
Operating Segments [Member] | Oilfield Services [Member]
Segment Reporting Information [Line Items]
Net sales	122.2	83.2	235.7	157.6
Gross profit/(loss)	39.3	26.6	77.1	51.1
Operating income/(loss)	4.5	2.2	7.0	3.4
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate costs	$ (18.5)	$ (11.6)	$ (37.5)	$ (26.7)

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