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Pension and Other Postretirement Benefits - Funded status of plans (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets $ 0.0 $ 0.0
Current liabilities (10.3) (10.4)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (67.0) (62.6)
Current liabilities (1.8) (1.8)
Non-current liabilities (65.2) (60.8)
Net amount recognized (67.0) (62.6)
Net loss 94.0 89.7
Prior service cost (benefit) 1.1 1.2
Total 95.1 90.9
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets 385.8 358.4
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets 379.4 352.2
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets 318.8 295.9
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (107.9) (107.7)
Current liabilities (6.4) (7.1)
Non-current liabilities (101.5) (100.7)
Net amount recognized (107.9) (107.8)
Net loss 42.2 41.7
Prior service cost (benefit) (13.5) (16.7)
Total $ 28.7 $ 25.0