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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 29.7 $ 14.7 $ 53.5 $ 31.3
Defined benefit pension and other postretirement employee benefits:        
Amortization of actuarial (gain) loss included in net periodic cost, net of tax of $0.0, $0.4, $0.1 and $0.8 (0.1) 1.1 (0.1) 2.3
Other comprehensive income (loss), net of tax (0.1) 1.1 (0.1) 2.3
Comprehensive income $ 29.6 $ 15.8 $ 53.4 $ 33.6