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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Beginning Balance     $ (359.0) $ (370.4)
Other comprehensive income before reclassifications     (42.0) (6.4)
Amounts reclassified from accumulated other comprehensive loss     46.8 13.8
Total other comprehensive income (loss) (9.9) 35.1 4.8 7.4
Ending Balance (354.2) (363.0) (354.2) (363.0)
Interest expense 228.9 200.2 449.8 396.1
Revenue (12,520.8) (11,149.3) (25,430.7) (22,532.4)
Operating costs and expenses 11,639.1 10,367.2 23,519.6 20,787.6
Total (646.5) (553.3) (1,453.2) (1,308.6)
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     15.9 13.7
Total other comprehensive income (loss)     15.9 20.4
Ending Balance (331.3) (362.6) (331.3) (362.6)
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     (42.0) (13.5)
Amounts reclassified from accumulated other comprehensive loss     30.9 0.1
Total other comprehensive income (loss)     (11.1) (13.4)
Ending Balance (25.8) (3.3) (25.8) (3.3)
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 22.9 0.6 46.8 13.8
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 7.8 15.9 13.7
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 15.4 (7.2) 32.3 0.5
Operating costs and expenses $ (0.5) $ 0 $ (1.4) $ (0.4)