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Acquisitions and Dispositions - Investment Acquisition (Details) - USD ($) shares in Millions, $ in Millions		9 Months Ended
	Apr. 03, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity method investment		$ 2,671.0		$ 2,343.0
Value of common units		$ 40.0
Advantage
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Equity method investment	$ 66.5
Cash consideration	$ 26.0
Common Units \| Advantage
Schedule of Equity Method Investments [Line Items]
Contribution of common units (units)	1.3
Value of common units	$ 40.0
Advantage Joint Venture \| Advantage
Schedule of Equity Method Investments [Line Items]
Consideration transferred	$ 133.0
Forecast \| Midway Pipeline, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage			50.00%