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Employee Benefit Plans - Composition of Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 427.4 | $ 430.1 |
Other Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 22.0 | 21.7 |
Level 1 | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 151.3 | 146.3 |
Level 1 | Other Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13.8 | 14.0 |
Level 2 | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 45.6 | 47.6 |
Level 3 Inputs | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 230.5 | 236.2 | $ 254.1
Level 3 Inputs | Other Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 8.2 | 7.7 |
Germany | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 217.0 | 223.1 |
Germany | Level 3 Inputs | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 217.0 | 223.1 |
Canada | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14.8 | 9.6 |
Canada | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 19.7 | 23.3 |
Canada | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 59.5 | 50.6 |
Canada | Global Mutual Fund | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 6.8 |
Canada | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.4 | 0.5 |
Canada | Level 1 | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14.8 | 9.6 |
Canada | Level 1 | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 19.7 | 23.3 |
Canada | Level 1 | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 59.5 | 50.6 |
Canada | Level 1 | Global Mutual Fund | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 6.8 |
Canada | Level 1 | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.4 | 0.5 |
Norway | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.6 | 2.0 |
Norway | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.1 | 3.6 |
Norway | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 23.2 | 24.5 |
Norway | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 9.9 | 7.9 |
Norway | Foreign Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 5.4 | 4.7 |
Norway | Real Estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.2 | 4.2 |
Norway | Level 1 | Local Currency Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.6 | 2.0 |
Norway | Level 1 | Foreign Equities | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.1 | 3.6 |
Norway | Level 1 | Local Currency Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 23.2 | 24.5 |
Norway | Level 1 | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 8.8 | 6.7 |
Norway | Level 1 | Foreign Fixed Income | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 5.4 | 4.7 |
Norway | Level 3 Inputs | Cash and Other | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.1 | 1.2 |
Norway | Level 3 Inputs | Real Estate | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.2 | 4.2 |
United States | CMRT | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 45.6 | 47.6 |
United States | Level 2 | CMRT | Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 45.6 | $ 47.6 |

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