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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

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