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Benefit Plans, Domestic and Foreign Pension Plan Assets and Summary of Defined Benefit Pension Plan Assets Measured at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | $ 340.0 | $ 296.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 270.5 | 244.0 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 61.6 | 32.7 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 7.9 | 20.0 |
Equity Securities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 187.5 | 162.8 |
US Equities [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 169.7 | 135.4 |
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 | 169.7 | 135.4 |
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 | 17.8 | 27.4 |
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 | 17.8 | 27.4 |
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 | 98.8 | 113.6 |
Corporate Debt Instruments [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 98.8 | 113.6 |
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 | 82.6 | 80.9 |
Corporate Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 16.2 | 32.7 |
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 | 0.9 | 2.3 |
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 | 0.9 | 2.3 |
Other [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 52.8 | 18.0 |
Other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 0.4 | 0.3 |
Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 45.4 | 0.0 |
Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 7.0 | 17.7 |
U.S. Plans [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | 261.5 | 227.1 | $ 241.9
International Plans [Member] |  |  |
Fair value of plan assets [Abstract] |  |  |
Fair value of plan assets | $ 78.5 | $ 69.6 | $ 78.3

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