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Equity and Distributions, Reclassfications out of Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense $ 200.2 $ 186.6 $ 396.1 $ 373.1
Revenue (11,149.3) (9,789.8) (22,532.4) (21,042.3)
Operating costs and expenses 10,367.2 9,009.5 20,787.6 19,476.7
Total (553.3) (567.2) (1,308.6) (1,222.7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Total 0.6   13.8  
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 7.8   13.7  
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]        
Revenue (7.2)   0.5  
Operating costs and expenses $ 0   $ (0.4)