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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Components of net annual benefit cost (income):        
Contributions by employer     $ 0.0 $ 7.0
Pensions        
Components of net annual benefit cost (income):        
Service cost $ 1.4 $ (0.1) 3.6 2.4
Interest cost 9.3 11.4 27.6 35.7
Expected return on plan assets (9.2) (13.3) (27.8) (40.1)
Amortization of prior service cost (credit) 0.0 0.1 0.1 0.2
Recognized net actuarial and other (gain) loss 11.1 0.5 16.0 9.7
Recognized loss due to settlement 0.6 0.5 0.6 0.5
Net periodic benefit cost (income) 13.2 (0.9) 20.1 8.4
Other Benefits        
Components of net annual benefit cost (income):        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.1 0.1 0.3 0.5
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost (credit) 0.0 0.1 0.0 0.1
Recognized net actuarial and other (gain) loss (0.3) (0.4) (0.7) (0.8)
Recognized loss due to settlement 0.0 0.0 0.0 0.0
Net periodic benefit cost (income) $ (0.2) $ (0.2) $ (0.4) $ (0.2)