Equity, Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jan. 20, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Sep. 30, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Distribution Made to Member or Limited Partner | |||||||||||||||
| General partner’s distributions | $ 75.0 | $ 46.0 | $ 13.0 | ||||||||||||
| Common | 259.0 | 171.0 | 103.0 | ||||||||||||
| Total cash distributions | 334.0 | 217.0 | 116.0 | ||||||||||||
| Quarterly cash distribution | |||||||||||||||
| Distribution Made to Member or Limited Partner | |||||||||||||||
| Declaration date | Jan. 20, 2016 | Oct. 18, 2016 | |||||||||||||
| Total cash distributions declared | $ 98.0 | $ 131.0 | $ 123.0 | $ 108.0 | |||||||||||
| Cash distributions paid per unit | $ 0.7800 | $ 0.875 | $ 0.842 | $ 0.810 | |||||||||||
| Date of distribution | Feb. 12, 2016 | Nov. 14, 2016 | Aug. 12, 2016 | May 13, 2016 | |||||||||||
| Unitholders record date | Feb. 02, 2016 | Nov. 04, 2016 | Aug. 02, 2016 | May 02, 2016 | |||||||||||
| Rockies Natural Gas Business Acquisition | |||||||||||||||
| Distribution Made to Member or Limited Partner | |||||||||||||||
| General partner distributions forfeited | (10.0) | ||||||||||||||
| General Partner | |||||||||||||||
| Distribution Made to Member or Limited Partner | |||||||||||||||
| General partner’s distributions | 6.0 | 5.0 | 2.0 | ||||||||||||
| General partner’s IDRs | [1],[2] | 69.0 | 41.0 | 11.0 | |||||||||||
| Common | |||||||||||||||
| Distribution Made to Member or Limited Partner | |||||||||||||||
| Common | 259.0 | 157.0 | 71.0 | ||||||||||||
| Subordinated | |||||||||||||||
| Distribution Made to Member or Limited Partner | |||||||||||||||
| Common | [3] | $ 0.0 | $ 14.0 | $ 32.0 | |||||||||||
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