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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 5.8 $ 36.6 $ (2.8) $ 90.1
Defined benefit pension and other postretirement employee benefits:        
Amortization of actuarial gain included in net periodic cost, net of immaterial tax 0.0 (0.1) (0.1) (0.2)
Other comprehensive income (loss), net of tax 0.0 (0.1) (0.1) (0.2)
Comprehensive income (loss) $ 5.8 $ 36.6 $ (2.9) $ 89.9