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Pension and Postretirement Benefits (Components of net periodic benefit) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Pension Benefits    
Components of net periodic benefit cost    
Service costs $ 1.1 $ 0.9
Interest costs 0.5 0.7
Expected return on plan assets (2.9) (2.7)
Recognized net actuarial loss 0.5 0.6
Net periodic benefit (income) expense (0.8) (0.5)
Postretirement Benefits    
Components of net periodic benefit cost    
Service costs 0.0 0.0
Interest costs 0.0 0.1
Expected return on plan assets 0.0 0.0
Recognized net actuarial loss 0.1 0.0
Net periodic benefit (income) expense $ 0.1 $ 0.1