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Pension, Health Care and Other Postretirement Benefits - Summary of the Fair Value of the Defined Benefit Pension Plan Assets (Details) - Defined Benefit Pension - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy $ 341.9 $ 356.4 $ 325.7
Total investments 483.6 462.5 414.0
Fair Value Measured at NAV or Equivalent      
Defined Benefit Plan Disclosure [Line Items]      
Investments measured at NAV or its equivalent 141.7 106.1 88.3
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 13.5 38.2 37.6
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 328.4 318.2 288.1
Equity investments      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 133.1 134.9 115.7
Equity investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 13.5 13.9 7.9
Equity investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 119.6 121.0 107.8
Fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 172.1 182.3 173.4
Fixed income investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 24.3 29.7
Fixed income investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 172.1 158.0 143.7
Other assets      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy 36.7 39.2 36.6
Other assets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Investments in fair value hierarchy $ 36.7 $ 39.2 $ 36.6