v3.7.0.1

Related-Party Transactions Related-Party Transactions, Summary of Affiliate Transactions (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended			12 Months Ended
		May 15, 2017	Apr. 19, 2017	Mar. 31, 2017		Mar. 31, 2016	Dec. 31, 2016
Distribution Made to Limited Partner, Cash Paid				$ 77.0
Distribution Made to Limited Partner, Distributions Declared, Per Unit				$ 0.94	[1]		$ 0.91
Distribution Made to Limited Partner, Distribution Date							Feb. 14, 2017
Distribution Made to Limited Partner, Cash Distributions Paid				$ 94.0		$ 73.0
Subsequent Event
Distribution Made to Limited Partner, Declaration Date			Apr. 19, 2017
Distribution Made to Limited Partner, Distribution Date	[1]	May 15, 2017
Distribution Made to Limited Partner, Cash Distributions Paid		$ 71.0
Rockies Natural Gas Business Acquisition [Member]
managing member or general partner, subsequent distribution amount forfeited				$ 12.5
[1] This distribution was declared on April 19, 2017 and will be paid on the date of distribution. This distribution is net of $12.5 million of IDRs waived by TLGP for the three months ended March 31, 2017.

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