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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pensions        
Components of net annual benefit cost (income):        
Service cost $ 0.7 $ 0.7 $ 1.5 $ 1.4
Interest cost 11.9 12.5 23.9 25.1
Expected return on plan assets (11.2) (11.8) (22.4) (23.7)
Amortization of net actuarial and other (gain) loss 3.5 3.9 7.0 7.9
Recognized (gain) loss due to curtailments, settlements, and other (0.1) 0.0 (0.2) 0.0
Net periodic benefit cost (income) 5.0 5.3 10.2 10.7
Other Benefits        
Components of net annual benefit cost (income):        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.1 0.2 0.2 0.3
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of net actuarial and other (gain) loss (0.2) (0.2) (0.4) (0.4)
Recognized (gain) loss due to curtailments, settlements, and other 0.0 0.0 0.0 0.0
Net periodic benefit cost (income) $ (0.1) $ 0.0 $ (0.2) $ (0.1)