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Goodwill - Summary of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Gross cost, beginning balance	$ 598.3	$ 611.3
Accumulated impairment losses, beginning balance	(236.5)	(236.5)
Net book amount, beginning balance	361.8	374.8
Exchange effect	(4.4)	10.2
Measurement period adjustment		(23.1)
Acquisition	7.5
Gross cost, ending balance	601.4	598.3
Accumulated impairment losses, ending balance	(236.5)	(236.5)
Net book amount, ending balance	364.9	361.8
Fuel Specialties [Member]
Goodwill [Line Items]
Gross cost, beginning balance	207.9	207.9
Accumulated impairment losses, beginning balance	0.0	0.0
Net book amount, beginning balance	207.9	207.9
Exchange effect	0.0	0.0
Measurement period adjustment		0.0
Acquisition	0.0
Gross cost, ending balance	207.9	207.9
Accumulated impairment losses, ending balance	0.0	0.0
Net book amount, ending balance	207.9	207.9
Performance Chemicals [Member]
Goodwill [Line Items]
Gross cost, beginning balance	116.6	129.6
Accumulated impairment losses, beginning balance	0.0	0.0
Net book amount, beginning balance	116.6	129.6
Exchange effect	(4.4)	10.2
Measurement period adjustment		(23.1)
Acquisition	0.0
Gross cost, ending balance	112.2	116.6
Accumulated impairment losses, ending balance	0.0	0.0
Net book amount, ending balance	112.2	116.6
Oilfield Services [Member]
Goodwill [Line Items]
Gross cost, beginning balance	37.3	37.3
Accumulated impairment losses, beginning balance	0.0	0.0
Net book amount, beginning balance	37.3	37.3
Exchange effect	0.0	0.0
Measurement period adjustment		0.0
Acquisition	7.5
Gross cost, ending balance	44.8	37.3
Accumulated impairment losses, ending balance	0.0	0.0
Net book amount, ending balance	44.8	37.3
Octane Additives [Member]
Goodwill [Line Items]
Gross cost, beginning balance	236.5	236.5
Accumulated impairment losses, beginning balance	(236.5)	(236.5)
Net book amount, beginning balance	0.0	0.0
Exchange effect	0.0	0.0
Measurement period adjustment		0.0
Acquisition	0.0
Gross cost, ending balance	236.5	236.5
Accumulated impairment losses, ending balance	(236.5)	(236.5)
Net book amount, ending balance	$ 0.0	$ 0.0

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