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Employee Benefit Plans - Composition of Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 491.7 | $ 427.4 |
Other Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 26.1 | 22.0 |
Quoted Prices in Active Markets (Level 1) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 171.6 | 151.3 |
Quoted Prices in Active Markets (Level 1) | Other Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 16.0 | 13.8 |
Significant Other Observable Inputs (Level 2) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 46.5 | 45.6 |
Significant Unobservable Inputs (Level 3) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 273.6 | 230.5 | $ 236.2
Significant Unobservable Inputs (Level 3) | Other Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 10.1 | 8.2 |
Germany | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 257.9 | 217.0 |
Germany | Significant Unobservable Inputs (Level 3) | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 257.9 | 217.0 |
Canada | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 8.4 | 14.8 |
Canada | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 16.4 | 19.7 |
Canada | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 81.8 | 59.5 |
Canada | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.3 | 0.4 |
Canada | Quoted Prices in Active Markets (Level 1) | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 8.4 | 14.8 |
Canada | Quoted Prices in Active Markets (Level 1) | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 16.4 | 19.7 |
Canada | Quoted Prices in Active Markets (Level 1) | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 81.8 | 59.5 |
Canada | Quoted Prices in Active Markets (Level 1) | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.3 | 0.4 |
Norway | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.8 | 1.6 |
Norway | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.6 | 4.1 |
Norway | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 21.0 | 23.2 |
Norway | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 15.4 | 9.9 |
Norway | Foreign Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.8 | 5.4 |
Norway | Real Estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.7 | 4.2 |
Norway | Quoted Prices in Active Markets (Level 1) | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.8 | 1.6 |
Norway | Quoted Prices in Active Markets (Level 1) | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.6 | 4.1 |
Norway | Quoted Prices in Active Markets (Level 1) | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 21.0 | 23.2 |
Norway | Quoted Prices in Active Markets (Level 1) | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14.5 | 8.8 |
Norway | Quoted Prices in Active Markets (Level 1) | Foreign Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.8 | 5.4 |
Norway | Significant Unobservable Inputs (Level 3) | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.9 | 1.1 |
Norway | Significant Unobservable Inputs (Level 3) | Real Estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.7 | 4.2 |
U.S. | CMRT | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 46.5 | 45.6 |
U.S. | Significant Other Observable Inputs (Level 2) | CMRT | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 46.5 | $ 45.6 |

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