Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended									9 Months Ended
	Oct. 18, 2017	Oct. 17, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	[1]	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	[2]	Sep. 30, 2016	[1]
Subsequent Event [Line Items]
Distributions paid per limited partner unit (in dollars per share)			$ 0.3180	$ 0.30410	$ 0.291	$ 0.27700	$ 0.26375		$ 0.2500	$ 0.2350	$ 0.2200	$ 0.9131		$ 0.74880
Subsequent Event
Subsequent Event [Line Items]
Distributions paid per limited partner unit (in dollars per share)	$ 0.3180
Subsequent Event | Crestwood Basin Interest
Subsequent Event [Line Items]
Ownership		50.00%
Payment for equity interest		$ 49.9

[1] Prior period financial information has been retrospectively adjusted for the acquisition of the Shell Delta, Na Kika and Refinery Gas Pipeline Operations.

[2] The financial information for the nine months ended September 30, 2017 reflects adjustments for the acquisition of the Shell Delta, Na Kika and Refinery Gas Pipeline Operations from January 1, 2017 through May 9, 2017.