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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ (280.0) |  |  |  | $ (219.2) | $ (280.0) | $ (219.2) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (44.3) | (151.6) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |  |  | 152.6 | 90.8 |
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | 108.3 | (60.8) | $ 22.4
Ending balance | $ (171.7) |  |  |  | $ (280.0) |  |  |  | (171.7) | (280.0) | (219.2)
Interest expense |  |  |  |  |  |  |  |  | 984.6 | 982.6 | 961.8
Operating costs and expenses |  |  |  |  |  |  |  |  | 25,557.5 | 19,643.5 | 23,668.7
Total | (797.3) | $ (621.3) | $ (666.0) | (771.0) | (669.7) | $ (643.1) | $ (570.0) | (670.2) | (2,855.6) | (2,553.0) | (2,558.4)
Gains (Losses) on Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | (83.8) |  |  |  | 56.6 | (83.8) | 56.6 |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (38.5) | (193.8) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |  |  | 112.2 | 53.4 |
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | 73.7 | (140.4) |
Ending balance | (10.1) |  |  |  | (83.8) |  |  |  | (10.1) | (83.8) | 56.6
Gains (Losses) on Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | (199.8) |  |  |  | (279.5) | (199.8) | (279.5) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (5.7) | 42.3 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |  |  | 40.4 | 37.4 |
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | 34.7 | 79.7 |
Ending balance | (165.1) |  |  |  | (199.8) |  |  |  | (165.1) | (199.8) | (279.5)
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 3.6 |  |  |  | $ 3.7 | 3.6 | 3.7 |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (0.1) | (0.1) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | (0.1) | (0.1) |
Ending balance | $ 3.5 |  |  |  | $ 3.6 |  |  |  | 3.5 | 3.6 | $ 3.7
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 152.6 | 90.8 |
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Commodity Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 111.6 | 53.6 |
Operating costs and expenses |  |  |  |  |  |  |  |  | 0.6 | (0.2) |
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Interest Rate Derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 40.4 | $ 37.4 |

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