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Equity and Distributions, Reclassfications out of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | $ 195.9 | $ 186.5
Revenues | (11,383.1) | (11,252.5)
Operating costs and expenses | 10,420.4 | 10,467.2
Total | (755.3) | (655.5)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Total | 13.2 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest expense | 5.9 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Revenues | 7.7 |
Operating costs and expenses | $ (0.4) |

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