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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 1.9 $ 21.4 $ (37.6) $ 54.5
Other comprehensive income:        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax (2.8) 0.0 (2.8) 0.0
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, $2.0 and $1.9 2.0 1.8 5.8 5.5
Other comprehensive income (loss), net of tax (0.8) 1.8 3.0 5.5
Comprehensive income $ 1.1 $ 23.2 $ (34.6) $ 60.0