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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pensions    
Components of net annual benefit cost (income):    
Service cost $ 0.7 $ 1.1
Interest cost 12.6 7.3
Expected return on plan assets (11.9) (7.8)
Amortization of prior service cost (credit) 0.0 0.0
Recognized net actuarial and other (gain) loss 4.0 4.5
Recognized loss due to settlement 0.0 0.4
Net periodic benefit cost (income) 5.4 5.5
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 prior service cost (credit) 0.0 0.0
Recognized net actuarial and other (gain) loss (0.2) (0.2)
Recognized loss due to settlement 0.0 0.0
Net periodic benefit cost (income) $ (0.1) $ (0.1)