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Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2021
Equity [Abstract]      
Cumulative income tax benefit on pension and postretirement benefit plans $ 27.0 $ 27.0 $ 32.7
Cumulative income tax benefit on derivatives 10.7 10.7 $ 6.5
Curtailment gain $ 0.6 $ 1.8