Equity, Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jan. 20, 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 | ||||||||||
| Total cash distributions declared | $ 98.0 | ||||||||||
| Cash distributions paid per unit | $ 0.7800 | ||||||||||
| Date of distribution | Feb. 12, 2016 | ||||||||||
| Unitholders record date | Feb. 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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