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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME    
Net income $ 911.5 $ 771.0
Commodity derivative instruments:    
Changes in fair value of cash flow hedges 3.4 144.8
Reclassification of losses (gains) to net income (14.5) 7.1
Interest rate derivative instruments:    
Changes in fair value of cash flow hedges 11.1 2.4
Reclassification of losses to net income 10.5 9.6
Total cash flow hedges 10.5 163.9
Other 0.0 (0.1)
Total other comprehensive income 10.5 163.8
Comprehensive income 922.0 934.8
Comprehensive income attributable to noncontrolling interests (10.8) (10.3)
Comprehensive income attributable to limited partners $ 911.2 $ 924.5