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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pensions    
Components of net annual benefit cost (income):    
Service cost $ 0.8 $ 0.7
Interest cost 11.9 12.6
Expected return on plan assets (11.2) (11.9)
Amortization of net actuarial and other (gain) loss 3.5 4.0
Recognized (gain) loss due to curtailments, settlements, and other (0.1) 0.0
Net periodic benefit cost (income) 5.1 5.4
Other Benefits    
Components of net annual benefit cost (income):    
Service cost 0.0 0.0
Interest cost 0.1 0.1
Expected return on plan assets 0.0 0.0
Amortization of net actuarial and other (gain) loss (0.2) (0.2)
Recognized (gain) loss due to curtailments, settlements, and other 0.0 0.0
Net periodic benefit cost (income) $ (0.1) $ (0.1)