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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)

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