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Pension and Other Postretirement Benefits - Funded status of plans (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets $ 0.0 $ 0.0
Current liabilities (8.9) (10.3)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (30.4) (67.0)
Current liabilities (1.8) (1.8)
Non-current liabilities (28.6) (65.2)
Net amount recognized (30.4) (67.0)
Net loss 61.2 94.0
Prior service cost (benefit) 0.9 1.1
Total 62.1 95.1
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets 360.1 385.8
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets 355.7 379.4
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets 329.7 318.8
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (99.6) (107.9)
Current liabilities (6.3) (6.4)
Non-current liabilities (93.3) (101.5)
Net amount recognized (99.6) (107.9)
Net loss 35.0 42.2
Prior service cost (benefit) (10.3) (13.5)
Total $ 24.7 $ 28.7