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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net income $ 20.6 $ 1.9 $ 51.9 $ (37.6)
Other comprehensive income:        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 0.0 (2.8) 0.0 (2.8)
Defined benefit pension and other postretirement employee benefits:        
Amortization of actuarial loss included in net periodic cost, net of tax of $0.4, $0.7, $1.2, and $2.0 1.1 2.0 3.5 5.8
Other comprehensive income (loss), net of tax 1.1 (0.8) 3.5 3.0
Comprehensive income $ 21.8 $ 1.1 $ 55.4 $ (34.6)