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Benefit Plans, Defined Benefit Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | $ 358.2 | $ 340.0 |
U.S. Plans [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 271.6 | 261.5 | $ 227.1
International Plans [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 86.6 | 78.5 | $ 69.6
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 280.7 | 270.5 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 69.2 | 61.6 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 8.3 | 7.9 |
Equity Securities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 200.0 | 187.5 |
US Equities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 182.0 | 169.7 |
US Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 182.0 | 169.7 |
US Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
US Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Non-US Equities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 18.0 | 17.8 |
Non-US Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 18.0 | 17.8 |
Non-US Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Non-US Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Fixed Income Securities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 99.7 | 98.8 |
Corporate Debt Instruments [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 99.7 | 98.8 |
Corporate Debt Instruments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 80.4 | 82.6 |
Corporate Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 19.3 | 16.2 |
Corporate Debt Instruments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Real Estate [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 1.0 | 0.9 |
Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 1.0 | 0.9 |
Other [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 57.5 | 52.8 |
Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.3 | 0.4 |
Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 49.9 | 45.4 |
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | $ 7.3 | $ 7.0 |

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