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Defined Contribution and Defined Benefit Retirement - Composition of Pension Plan Assets (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 454.0 | $ 491.7 |
Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 410.7 | 445.2 | $ 381.8
Germany |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 241.5 | 257.9 |
Canada | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.5 | 8.4 |
Canada | Foreign Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 16.4 |
Canada | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 74.1 | 81.8 |
Canada | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.5 | 0.3 |
Canada | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13.3 |  |
Norway | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.7 | 1.8 |
Norway | Foreign Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 4.6 |
Norway | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 20.4 | 21.0 |
Norway | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13.5 | 15.4 |
Norway | Foreign Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 6.8 |
Norway | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.5 | 4.7 |
Norway | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.3 |  |
Norway | Non Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.1 |  |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 24.4 | 26.1 |
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 43.2 | 46.5 | 45.6
U.S. | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.7 |  |
U.S. | CMRT |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2.3 | 46.5 |
U.S. | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 16.3 |  |
U.S. | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 19.9 |  |
Quoted Prices in Active Markets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 176.2 | 171.6 |
Quoted Prices in Active Markets (Level 1) | Canada | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.5 | 8.4 |
Quoted Prices in Active Markets (Level 1) | Canada | Foreign Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 16.4 |
Quoted Prices in Active Markets (Level 1) | Canada | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 74.1 | 81.8 |
Quoted Prices in Active Markets (Level 1) | Canada | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.5 | 0.3 |
Quoted Prices in Active Markets (Level 1) | Canada | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13.3 |  |
Quoted Prices in Active Markets (Level 1) | Norway | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.7 | 1.8 |
Quoted Prices in Active Markets (Level 1) | Norway | Foreign Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 4.6 |
Quoted Prices in Active Markets (Level 1) | Norway | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 14.9 | 21.0 |
Quoted Prices in Active Markets (Level 1) | Norway | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 12.7 | 14.5 |
Quoted Prices in Active Markets (Level 1) | Norway | Foreign Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 6.8 |
Quoted Prices in Active Markets (Level 1) | Norway | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.3 |  |
Quoted Prices in Active Markets (Level 1) | Norway | Non Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.1 |  |
Quoted Prices in Active Markets (Level 1) | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13.9 | 16.0 |
Quoted Prices in Active Markets (Level 1) | U.S. | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3.4 |  |
Quoted Prices in Active Markets (Level 1) | U.S. | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.9 |  |
Quoted Prices in Active Markets (Level 1) | U.S. | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 19.9 |  |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 5.5 | 46.5 |
Significant Other Observable Inputs (Level 2) | Norway | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 5.5 |  |
Significant Other Observable Inputs (Level 2) | U.S. | CMRT |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 46.5 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 259.6 | 273.6 | $ 230.5
Significant Unobservable Inputs (Level 3) | Germany |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 241.5 | 257.9 |
Significant Unobservable Inputs (Level 3) | Norway | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.8 | 0.9 |
Significant Unobservable Inputs (Level 3) | Norway | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.5 | 4.7 |
Significant Unobservable Inputs (Level 3) | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 10.5 | $ 10.1 |
Significant Unobservable Inputs (Level 3) | U.S. | CMRT |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2.3 |  |
Assets measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 12.7 |  |
Assets measured at NAV | U.S. | Cash And Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.3 |  |
Assets measured at NAV | U.S. | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 11.4 |  |

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