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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
STATEMENTS OF UNAUDITED CONSOLIDATED COMPREHENSIVE INCOME    
Net income $ 771.0 $ 670.2
Commodity derivative instruments:    
Changes in fair value of cash flow hedges 144.8 (1.2)
Reclassification of losses (gains) to net income 7.1 (57.2)
Interest rate derivative instruments:    
Changes in fair value of cash flow hedges 2.4 0.0
Reclassification of losses to net income 9.6 9.2
Total cash flow hedges 163.9 (49.2)
Other (0.1) (0.1)
Total other comprehensive income (loss) 163.8 (49.3)
Comprehensive income 934.8 620.9
Comprehensive income attributable to noncontrolling interests (10.3) (9.0)
Comprehensive income attributable to limited partners $ 924.5 $ 611.9