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Employee Benefits - Amounts Recognized on the Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Pension and OPEB obligations	$ 422.8	$ 397.4
Pension Costs
Defined Benefit Plan Disclosure [Line Items]
Other long-term assets	139.1	143.0
Pension and OPEB obligations	375.5	339.9
Total net (liabilities) assets	(236.4)	(196.9)
OPEB Costs
Defined Benefit Plan Disclosure [Line Items]
Other long-term assets	210.8	80.5
Pension and OPEB obligations	47.3	57.5
Total net (liabilities) assets	$ 163.5	$ 23.0

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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