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Pension and Other Postretirement Benefits - Funded status of plans (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets $ 0.0 $ 0.0
Current liabilities (10.4) (11.0)
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets 358.4 314.4
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (62.6) (52.7)
Current liabilities (1.8) (1.8)
Non-current liabilities (60.8) (50.9)
Net amount recognized (62.6) (52.7)
Net loss 89.7 83.7
Prior service cost (benefit) 1.2 1.4
Total 90.9 85.1
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets 352.2 310.0
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets 295.9 261.7
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (107.7) (108.7)
Current liabilities (7.1) (7.5)
Non-current liabilities (100.7) (101.2)
Net amount recognized (107.8) (108.7)
Net loss 41.7 43.9
Prior service cost (benefit) (16.7) (21.6)
Total $ 25.0 $ 22.3