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Equity and Distributions, Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Beginning Balance       $ (370.4)       $ (351.4) $ (370.4) $ (351.4)  
Other comprehensive income before reclassifications                 (39.9) (50.3)  
Amounts reclassified from accumulated other comprehensive income                 51.3 31.3  
Total other comprehensive income                 11.4 (19.0) (317.8)
Ending Balance (359.0)       (370.4)       (359.0) (370.4) (351.4)
Interest expense                 802.5 771.8 744.1
Revenue (13,101.3) (12,093.3) (11,149.3) (11,383.1) (11,072.1) (10,468.7) (9,789.8) (11,252.5) (47,727.0) (42,583.1) (44,313.0)
Operating costs and expenses                 44,238.7 39,367.9 41,318.5
Total (705.7) (592.8) (553.3) (755.3) (617.4) (587.9) (567.2) (655.5) (2,607.1) (2,428.0) (2,088.3)
Gains and Losses on Cash Flow Hedges [Member] | Interest rate derivatives [Member]
                     
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Beginning Balance       (383.0)       (329.0) (383.0) (329.0)  
Other comprehensive income before reclassifications                 6.6 (70.2)  
Amounts reclassified from accumulated other comprehensive income                 29.2 16.2  
Total other comprehensive income                 35.8 (54.0)  
Ending Balance (347.2)       (383.0)       (347.2) (383.0)  
Gains and Losses on Cash Flow Hedges [Member] | Commodity derivatives [Member]
                     
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Beginning Balance       10.1       (21.4) 10.1 (21.4)  
Other comprehensive income before reclassifications                 (46.9) 17.3  
Amounts reclassified from accumulated other comprehensive income                 22.1 14.2  
Total other comprehensive income                 (24.8) 31.5  
Ending Balance (14.7)       10.1       (14.7) 10.1  
Foreign Currency Translation Adjustment [Member]
                     
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Beginning Balance       1.7       1.7 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       1.7 1.7  
Postretirement Benefit Plans [Member]
                     
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Beginning Balance       0.8       (1.7) 0.8 (1.7)  
Other comprehensive income before reclassifications                 0.4 2.6  
Amounts reclassified from accumulated other comprehensive income                 0 (0.1)  
Total other comprehensive income                 0.4 2.5  
Ending Balance 1.2       0.8       1.2 0.8  
Other [Member]
                     
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Beginning Balance               (1.0)   (1.0)  
Other comprehensive income before reclassifications                   0  
Amounts reclassified from accumulated other comprehensive income                   1.0  
Total other comprehensive income                   1.0  
Ending Balance         0         0  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Cash Flow Hedges [Member]
                     
Accumulated Other Comprehensive Income (Loss) [Abstract]                      
Total                 51.3 30.4  
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                 29.2 16.2  
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                 22.4 (10.1)  
Operating costs and expenses                 $ (0.3) $ 24.3