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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 548.2 | $ 498.4 |
Quoted Prices in Active Markets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 204.9 | 191.6 |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 10.1 | 8.7 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 314.8 | 283.5 | $ 259.6
Assets measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 18.4 | 14.6 |
Non U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 494.8 | 450.0 | 410.7
Germany |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 292.5 | 264.5 |
Germany | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 292.5 | 264.5 |
Canada | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.2 | 8.3 |
Canada | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 26.6 | 16.3 |
Canada | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 87.3 | 80.9 |
Canada | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.9 | 0.6 |
Canada | Quoted Prices in Active Markets (Level 1) | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.2 | 8.3 |
Canada | Quoted Prices in Active Markets (Level 1) | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 26.6 | 16.3 |
Canada | Quoted Prices in Active Markets (Level 1) | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 87.3 | 80.9 |
Canada | Quoted Prices in Active Markets (Level 1) | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.9 | 0.6 |
Norway | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3.2 | 1.6 |
Norway | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.3 | 4.2 |
Norway | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 26.4 | 22.8 |
Norway | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 5.5 | 8.2 |
Norway | Non Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 7.7 | 8.3 |
Norway | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 7.1 | 6.6 |
Norway | Quoted Prices in Active Markets (Level 1) | Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3.2 | 1.6 |
Norway | Quoted Prices in Active Markets (Level 1) | Non Local Currency Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 6.3 | 4.2 |
Norway | Quoted Prices in Active Markets (Level 1) | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 16.3 | 14.1 |
Norway | Quoted Prices in Active Markets (Level 1) | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.8 | 7.4 |
Norway | Quoted Prices in Active Markets (Level 1) | Non Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 7.7 | 8.3 |
Norway | Significant Other Observable Inputs (Level 2) | Local Currency Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 10.1 | 8.7 |
Norway | Significant Unobservable Inputs (Level 3) | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.7 | 0.8 |
Norway | Significant Unobservable Inputs (Level 3) | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 7.1 | 6.6 |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 31.1 | 27.6 |
Other | Quoted Prices in Active Markets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 17.3 | 16.6 |
Other | Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13.8 | 11.0 |
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 53.3 | 48.4 | $ 43.2
U.S. | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 5.7 | 6.0 |
U.S. | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 20.9 | 19.2 |
U.S. | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 26.8 | 23.3 |
U.S. | Quoted Prices in Active Markets (Level 1) | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 4.4 | 4.6 |
U.S. | Quoted Prices in Active Markets (Level 1) | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3.1 | 5.4 |
U.S. | Quoted Prices in Active Markets (Level 1) | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 26.8 | 23.3 |
U.S. | Significant Unobservable Inputs (Level 3) | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0.7 | 0.6 |
U.S. | Assets measured at NAV | Cash and Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1.3 | 1.4 |
U.S. | Assets measured at NAV | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 17.1 | $ 13.2 |

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