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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME    
Net income $ 806.7 $ 755.3
Commodity derivative instruments:    
Changes in fair value of cash flow hedges (9.2) (47.6)
Reclassification of losses to net income 16.0 7.3
Interest rate derivative instruments:    
Changes in fair value of cash flow hedges 0 6.7
Reclassification of losses to net income 7.9 5.9
Total cash flow hedges 14.7 (27.7)
Comprehensive income 821.4 727.6
Comprehensive income attributable to noncontrolling interests (7.9) (1.8)
Comprehensive income attributable to limited partners $ 813.5 $ 725.8