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Pension, Health Care and Postretirement Benefits Other Than Pensions - Summary of the Fair Value of the Defined Benefit Pension Plan Assets (Details) - Defined Benefit Pension - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy $ 325.7 $ 864.1 $ 935.1
Total investments 414.0 1,030.5 1,468.6
Fair Value Measured at NAV or Equivalent      
Defined Benefit Plan Disclosure [Line Items]      
Investments measured at NAV or its equivalent 88.3 166.4 533.5
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 37.6 586.8 556.7
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 288.1 277.3 378.4
Equity investments      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 115.7 215.8 515.0
Equity investments | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 7.9 124.0 409.9
Equity investments | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 107.8 91.8 105.1
Fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 173.4 609.9 380.9
Fixed income investments | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 29.7 462.8 146.8
Fixed income investments | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 143.7 147.1 234.1
Other assets      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 36.6 38.4 39.2
Other assets | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy $ 36.6 $ 38.4 $ 39.2