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Commitments and Contingencies - MarkWest Environmental Proceeding (Details) - Pending Litigation - MarkWest Liberty Midstream Pipeline Launcher/Receiver Site [Member] $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Cash
Loss Contingencies [Line Items]
Alleged amount overcharged from customers	$ 2.4
Other Liabilities
Loss Contingencies [Line Items]
Alleged amount overcharged from customers	$ 3.6

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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