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Goodwill - Summary of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
At January 1, Gross cost	$ 512.6	$ 424.4
At January 1, Accumulated impairment losses	(236.5)	(236.5)
At January 1, Net book amount	276.1	187.9
Exchange effect	(0.2)	(0.4)
Acquisitions		88.1
Disposals	(7.6)
Adjustments to purchase price allocation	(0.9)	0.5
At December 31, Gross cost	503.9	512.6
At December 31, Accumulated impairment losses	(236.5)	(236.5)
At December 31, Net book amount	267.4	276.1
Fuel Specialties [Member]
Goodwill [Line Items]
At January 1, Gross cost	229.4	141.1
At January 1, Accumulated impairment losses	0.0	0.0
At January 1, Net book amount	229.4	141.1
Exchange effect	(0.2)	(0.3)
Acquisitions		88.1
Disposals	0.0
Adjustments to purchase price allocation	(0.9)	0.5
At December 31, Gross cost	228.3	229.4
At December 31, Accumulated impairment losses	0.0	0.0
At December 31, Net book amount	228.3	229.4
Performance Chemicals [Member]
Goodwill [Line Items]
At January 1, Gross cost	46.7	46.8
At January 1, Accumulated impairment losses	0.0	0.0
At January 1, Net book amount	46.7	46.8
Exchange effect	0.0	(0.1)
Acquisitions		0.0
Disposals	(7.6)
Adjustments to purchase price allocation	0.0	0.0
At December 31, Gross cost	39.1	46.7
At December 31, Accumulated impairment losses	0.0	0.0
At December 31, Net book amount	39.1	46.7
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
Exchange effect	0.0	0.0
Acquisitions		0.0
Disposals	0.0
Adjustments to purchase price allocation	0.0	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

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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
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-SubTopic 20
-Section 50
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