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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Beginning Balance     $ (359.0) $ (370.4)
Other comprehensive income before reclassifications     16.1 (15.0)
Amounts reclassified from accumulated other comprehensive loss     36.8 36.1
Total other comprehensive income (loss) 48.1 13.7 52.9 21.1
Ending Balance (306.1) (349.3) (306.1) (349.3)
Interest expense 229.8 208.3 679.6 604.4
Revenue (12,330.2) (12,093.3) (37,760.9) (34,625.7)
Operating costs and expenses 11,414.8 11,273.5 34,934.4 32,061.1
Total (699.2) (592.8) (2,152.4) (1,901.4)
Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member]
       
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Beginning Balance     (347.2) (383.0)
Other comprehensive income before reclassifications     0 6.7
Amounts reclassified from accumulated other comprehensive loss     23.9 21.4
Total other comprehensive income (loss)     23.9 28.1
Ending Balance (323.3) (354.9) (323.3) (354.9)
Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member]
       
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Beginning Balance     (14.7) 10.1
Other comprehensive income before reclassifications     16.1 (22.1)
Amounts reclassified from accumulated other comprehensive loss     12.9 14.7
Total other comprehensive income (loss)     29.0 (7.4)
Ending Balance 14.3 2.7 14.3 2.7
Other [Member]
       
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Beginning Balance     2.9 2.5
Other comprehensive income before reclassifications     0 0.4
Amounts reclassified from accumulated other comprehensive loss     0 0
Total other comprehensive income (loss)     0 0.4
Ending Balance 2.9 2.9 2.9 2.9
Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Total (10.0) 22.3 36.8 36.1
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 8.0 7.7 23.9 21.4
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 (17.8) 14.6 14.5 15.1
Operating costs and expenses $ (0.2) $ 0 $ (1.6) $ (0.4)