The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Weighted average useful life	5 years
Business Incentive Plan Asset [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
BIPs	$ 174.3		$ 173.0
BIPs amortization	16.3	$ 16.9
Prepaid Expenses and Other Current Assets [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	$ 47.8		$ 41.7