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Business Acquisitions, Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Basic earnings per unit [Abstract] |  |  |  |
As reported basic earnings per unit (in dollars per unit) | $ 0.33 | $ 0.38 | $ 0.94 | $ 1.16
Diluted earnings per unit [Abstract] |  |  |  |
As reported diluted earnings per unit (in dollars per unit) | $ 0.32 | $ 0.37 | $ 0.92 | $ 1.13
Eagle Ford Midstream Assets [Member] |  |  |  |
Pro forma earnings data [Abstract] |  |  |  |
Revenues |  | $ 12,388.7 | $ 20,993.5 | $ 37,927.5
Costs and expenses |  | 11,502.6 | 18,645.5 | 35,195.2
Operating income |  | 958.4 | 2,650.5 | 2,911.4
Net income |  | 715.3 | 1,900.9 | 2,195.5
Net income attributable to noncontrolling interests |  | 8.1 | 28.5 | 24.8
Net income attributable to limited partners |  | $ 707.2 | $ 1,872.4 | $ 2,170.7
Basic earnings per unit [Abstract] |  |  |  |
As reported basic earnings per unit (in dollars per unit) |  | $ 0.38 | $ 0.94 | $ 1.16
Pro forma basic earnings per unit (in dollars per unit) |  | 0.38 | 0.96 | 1.18
Diluted earnings per unit [Abstract] |  |  |  |
As reported diluted earnings per unit (in dollars per unit) |  | 0.37 | 0.92 | 1.13
Pro forma diluted earnings per unit (in dollars per unit) |  | $ 0.38 | $ 0.94 | $ 1.15

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