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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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