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Employee Benefits - Amounts Recognized on the Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Pension and OPEB obligations $ 397.4 $ 498.6
Pension Costs    
Defined Benefit Plan Disclosure [Line Items]    
Other long-term assets 143.0 74.4
Pension and OPEB obligations 339.9 424.0
Total net (liabilities) assets (196.9) (349.6)
OPEB Costs    
Defined Benefit Plan Disclosure [Line Items]    
Other long-term assets 80.5 29.7
Pension and OPEB obligations 57.5 74.6
Total net (liabilities) assets $ 23.0 $ (44.9)