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Goodwill - Summary of Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |
Gross cost, beginning balance | $ 601.4 | $ 598.3
Accumulated impairment losses, beginning balance | (236.5) | (236.5)
Net book amount, beginning balance | 364.9 | 361.8
Exchange effect | (1.9) | (4.4)
Acquisition |  | 7.5
Gross cost, ending balance | 599.5 | 601.4
Accumulated impairment losses, ending balance | (236.5) | (236.5)
Net book amount, ending balance | 363.0 | 364.9
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 | (0.2) | 0.0
Acquisition |  | 0.0
Gross cost, ending balance | 207.7 | 207.9
Accumulated impairment losses, ending balance | (0.0) | (0.0)
Net book amount, ending balance | 207.7 | 207.9
Performance Chemicals [Member] |  |
Goodwill [Line Items] |  |
Gross cost, beginning balance | 112.2 | 116.6
Accumulated impairment losses, beginning balance | (0.0) | (0.0)
Net book amount, beginning balance | 112.2 | 116.6
Exchange effect | (1.7) | (4.4)
Acquisition |  | 0.0
Gross cost, ending balance | 110.5 | 112.2
Accumulated impairment losses, ending balance | (0.0) | (0.0)
Net book amount, ending balance | 110.5 | 112.2
Oilfield Services [Member] |  |
Goodwill [Line Items] |  |
Gross cost, beginning balance | 44.8 | 37.3
Accumulated impairment losses, beginning balance | (0.0) | (0.0)
Net book amount, beginning balance | 44.8 | 37.3
Exchange effect | 0.0 | 0.0
Acquisition |  | 7.5
Gross cost, ending balance | 44.8 | 44.8
Accumulated impairment losses, ending balance | (0.0) | (0.0)
Net book amount, ending balance | 44.8 | 44.8
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
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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