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Goodwill - Summary of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
At January 1, Gross cost	$ 503.9	$ 512.6
At January 1, Accumulated impairment losses	(236.5)	(236.5)
At January 1, Net book amount	267.4	276.1
Additions	107.4
Exchange effect		(0.2)
Adjustment		(0.9)
Disposals		(7.6)
At December 31, Gross cost	611.3	503.9
At December 31, Accumulated impairment losses	(236.5)	(236.5)
At December 31, Net book amount	374.8	267.4
Fuel Specialties [Member]
Goodwill [Line Items]
At January 1, Gross cost	207.9	209.0
At January 1, Accumulated impairment losses	0.0	0.0
At January 1, Net book amount	207.9	209.0
Additions	0.0
Exchange effect		(0.2)
Adjustment		(0.9)
Disposals		0.0
At December 31, Gross cost	207.9	207.9
At December 31, Accumulated impairment losses	0.0	0.0
At December 31, Net book amount	207.9	207.9
Performance Chemicals [Member]
Goodwill [Line Items]
At January 1, Gross cost	22.2	29.8
At January 1, Accumulated impairment losses	0.0	0.0
At January 1, Net book amount	22.2	29.8
Additions	107.4
Exchange effect		0.0
Adjustment		0.0
Disposals		(7.6)
At December 31, Gross cost	129.6	22.2
At December 31, Accumulated impairment losses	0.0	0.0
At December 31, Net book amount	129.6	22.2
Oilfield Services [Member]
Goodwill [Line Items]
At January 1, Gross cost	37.3	37.3
At January 1, Accumulated impairment losses	0.0	0.0
At January 1, Net book amount	37.3	37.3
Additions	0.0
Exchange effect		0.0
Adjustment		0.0
Disposals		0.0
At December 31, Gross cost	37.3	37.3
At December 31, Accumulated impairment losses	0.0	0.0
At December 31, Net book amount	37.3	37.3
Octane Additives [Member]
Goodwill [Line Items]
At January 1, Gross cost	236.5	236.5
At January 1, Accumulated impairment losses	(236.5)	(236.5)
At January 1, Net book amount	0.0	0.0
Additions	0.0
Exchange effect		0.0
Adjustment		0.0
Disposals		0.0
At December 31, Gross cost	236.5	236.5
At December 31, Accumulated impairment losses	(236.5)	(236.5)
At December 31, Net book amount	$ 0.0	$ 0.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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+ References

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