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Pension and Other Postretirement Benefits - Funded status of plans (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Non-current assets $ 0.0 $ 0.0
Current liabilities (11.0) (11.0)
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets 314.4 344.1
Defined Benefit Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (52.7) (40.7)
Current liabilities (1.8) (1.8)
Non-current liabilities (50.9) (38.9)
Net amount recognized (52.7) (40.7)
Net loss 83.7 71.2
Prior service cost (benefit) 1.4 1.0
Total 85.1 72.2
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets 310.0 339.4
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets 261.7 303.4
Other Postretirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Funded status (108.7) (120.8)
Current liabilities (7.5) (7.5)
Non-current liabilities (101.2) (113.3)
Net amount recognized (108.7) (120.8)
Net loss 43.9 58.4
Prior service cost (benefit) (21.6) (28.9)
Total $ 22.3 $ 29.5