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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME    
Net income $ 670.2 $ 650.6
Commodity derivative instruments:    
Changes in fair value of cash flow hedges (1.2) 30.8
Reclassification of gains to net income (57.2) (61.1)
Interest rate derivative instruments:    
Reclassification of losses to net income 9.2 8.7
Total cash flow hedges (49.2) (21.6)
Other (0.1) 0.0
Total other comprehensive loss (49.3) (21.6)
Comprehensive income 620.9 629.0
Comprehensive income attributable to noncontrolling interests (9.0) (14.5)
Comprehensive income attributable to limited partners $ 611.9 $ 614.5