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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pensions        
Components of net annual benefit cost (income):        
Service cost $ 0.7 $ 1.2 $ 1.4 $ 2.3
Interest cost 12.5 7.2 25.1 14.5
Expected return on plan assets (11.8) (7.7) (23.7) (15.5)
Amortization of prior service cost (credit) 0.0 0.1 0.0 0.1
Recognized net actuarial and other (gain) loss 3.9 4.5 7.9 9.0
Recognized loss due to settlement 0.0 0.0 0.0 0.4
Net periodic benefit cost (income) 5.3 5.3 10.7 10.8
Other Benefits        
Components of net annual benefit cost (income):        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.2 0.1 0.3 0.2
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost (credit) 0.0 0.0 0.0 0.0
Recognized net actuarial and other (gain) loss (0.2) (0.2) (0.4) (0.4)
Recognized loss due to settlement 0.0 0.0 0.0 0.0
Net periodic benefit cost (income) $ 0.0 $ (0.1) $ (0.1) $ (0.2)