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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pensions        
Components of net annual benefit cost (income):        
Service cost $ 1.3 $ 1.4 $ 2.2 $ 2.5
Interest cost 9.2 12.1 18.3 24.3
Expected return on plan assets (9.3) (13.4) (18.6) (26.8)
Amortization of prior service cost (credit) 0.0 0.0 0.1 0.1
Recognized net actuarial and other (gain) loss 2.4 4.6 4.9 9.2
Net periodic benefit cost (income) 3.6 4.7 6.9 9.3
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 0.4
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)
Net periodic benefit cost (income) $ (0.1) $ 0.0 $ (0.2) $ 0.0