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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Beginning Balance $ (359.0) $ (370.4)
Other comprehensive income before reclassifications (9.2) (40.9)
Amounts reclassified from accumulated other comprehensive income 23.9 13.2
Total other comprehensive income 14.7 (27.7)
Ending Balance (344.3) (398.1)
Interest expense 220.9 195.9
Revenue (12,909.9) (11,383.1)
Operating costs and expenses 11,880.5 10,420.4
Total (806.7) (755.3)
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 income 7.9 5.9
Total other comprehensive income 7.9 12.6
Ending Balance (339.3) (370.4)
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 (9.2) (47.6)
Amounts reclassified from accumulated other comprehensive income 16.0 7.3
Total other comprehensive income 6.8 (40.3)
Ending Balance (7.9) (30.2)
Foreign Currency Translation Adjustment [Member]
    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Beginning Balance 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
Other [Member]
    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Beginning Balance 1.2 0.8
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income 0 0
Total other comprehensive income 0 0
Ending Balance 1.2 0.8
Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Total 23.9 13.2
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 7.9 5.9
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 16.9 7.7
Operating costs and expenses $ (0.9) $ (0.4)