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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ (370.4) |  |  |  | $ (351.4) | $ (370.4) | $ (351.4) |
Other comprehensive income before reclassifications |  |  |  |  |  |  |  |  | (39.9) | (50.3) |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  |  | 51.3 | 31.3 |
Total other comprehensive income |  |  |  |  |  |  |  |  | 11.4 | (19.0) | (317.8)
Ending Balance | (359.0) |  |  |  | (370.4) |  |  |  | (359.0) | (370.4) | (351.4)
Interest expense |  |  |  |  |  |  |  |  | 802.5 | 771.8 | 744.1
Revenue | (13,101.3) | (12,093.3) | (11,149.3) | (11,383.1) | (11,072.1) | (10,468.7) | (9,789.8) | (11,252.5) | (47,727.0) | (42,583.1) | (44,313.0)
Operating costs and expenses |  |  |  |  |  |  |  |  | 44,238.7 | 39,367.9 | 41,318.5
Total | (705.7) | (592.8) | (553.3) | (755.3) | (617.4) | (587.9) | (567.2) | (655.5) | (2,607.1) | (2,428.0) | (2,088.3)
Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (383.0) |  |  |  | (329.0) | (383.0) | (329.0) |
Other comprehensive income before reclassifications |  |  |  |  |  |  |  |  | 6.6 | (70.2) |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  |  | 29.2 | 16.2 |
Total other comprehensive income |  |  |  |  |  |  |  |  | 35.8 | (54.0) |
Ending Balance | (347.2) |  |  |  | (383.0) |  |  |  | (347.2) | (383.0) |
Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 10.1 |  |  |  | (21.4) | 10.1 | (21.4) |
Other comprehensive income before reclassifications |  |  |  |  |  |  |  |  | (46.9) | 17.3 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  |  | 22.1 | 14.2 |
Total other comprehensive income |  |  |  |  |  |  |  |  | (24.8) | 31.5 |
Ending Balance | (14.7) |  |  |  | 10.1 |  |  |  | (14.7) | 10.1 |
Foreign Currency Translation Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1.7 |  |  |  | 1.7 | 1.7 | 1.7 |
Other comprehensive income before reclassifications |  |  |  |  |  |  |  |  | 0 | 0 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  |  | 0 | 0 |
Total other comprehensive income |  |  |  |  |  |  |  |  | 0 | 0 |
Ending Balance | 1.7 |  |  |  | 1.7 |  |  |  | 1.7 | 1.7 |
Postretirement Benefit Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 0.8 |  |  |  | (1.7) | 0.8 | (1.7) |
Other comprehensive income before reclassifications |  |  |  |  |  |  |  |  | 0.4 | 2.6 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  |  | 0 | (0.1) |
Total other comprehensive income |  |  |  |  |  |  |  |  | 0.4 | 2.5 |
Ending Balance | 1.2 |  |  |  | 0.8 |  |  |  | 1.2 | 0.8 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  | (1.0) |  | (1.0) |
Other comprehensive income before reclassifications |  |  |  |  |  |  |  |  |  | 0 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  |  |  | 1.0 |
Total other comprehensive income |  |  |  |  |  |  |  |  |  | 1.0 |
Ending Balance |  |  |  |  | 0 |  |  |  |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 51.3 | 30.4 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 29.2 | 16.2 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22.4 | (10.1) |
Operating costs and expenses |  |  |  |  |  |  |  |  | $ (0.3) | $ 24.3 |

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