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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pensions    
Components of net annual benefit cost (income):    
Service cost $ 1.3 $ 0.9
Interest cost 6.1 9.1
Expected return on plan assets (7.1) (9.3)
Amortization of prior service cost (credit) 0.1 0.1
Recognized net actuarial and other (gain) loss 5.9 2.5
Net periodic benefit cost (income) 6.3 3.3
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)
Net periodic benefit cost (income) $ (0.1) $ (0.1)