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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]            
Net income $ (51.6) $ 12.1 $ 22.8 $ 10.3 $ (39.6) $ 33.1
Defined benefit pension and other postretirement employee benefits:            
Amortization of actuarial loss included in net periodic cost, net of tax of $0.7, $0.6, $1.3 and $1.3 1.9   1.8   3.8 3.7
Other comprehensive income (loss), net of tax 1.9   1.8   3.8 3.7
Comprehensive income $ (49.7)   $ 24.6   $ (35.8) $ 36.8