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Business Combinations, Pro Forma Earnings Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported basic earnings per unit (in dollars per unit) | $ 0.36 | $ 0.28 | $ 0.30 | $ 0.36 | $ 0.31 | $ 0.30 | $ 0.27 | $ 0.32 | $ 1.30 | $ 1.20 | $ 1.28
Diluted earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
As reported diluted earnings per unit (in dollars per unit) | $ 0.36 | $ 0.28 | $ 0.30 | $ 0.36 | $ 0.31 | $ 0.30 | $ 0.27 | $ 0.32 | $ 1.30 | $ 1.20 | $ 1.26
Eagle Ford Midstream Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Pro forma earnings data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 27,148.5
Costs and expenses |  |  |  |  |  |  |  |  |  |  | 23,937.1
Operating income |  |  |  |  |  |  |  |  |  |  | 3,585.0
Net income |  |  |  |  |  |  |  |  |  |  | 2,594.4
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 37.2
Net income attributable to limited partners |  |  |  |  |  |  |  |  |  |  | $ 2,557.2
Basic earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro forma basic earnings per unit (in dollars per unit) |  |  |  |  |  |  |  |  |  |  | $ 1.30
Diluted earnings per unit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro forma diluted earnings per unit (in dollars per unit) |  |  |  |  |  |  |  |  |  |  | $ 1.28

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