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Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]                
Pension and other postretirement benefit plans, tax (benefit) expense $ 0.2 $ (0.4) $ 0.5 $ 0.4 $ 0.0 $ (0.3) $ 0.3 $ 0.1
Cumulative income tax expense (benefit) on pension and postretirement benefit plans (14.1)     (12.9)     (14.1) (12.9)
Unrealized gain (loss) on derivatives, income tax expense (benefit) (0.7)     0.2     (5.6) 2.2
Cumulative income tax expense (benefit) on derivatives $ (5.1)     $ 1.6     $ (5.1) $ 1.6