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