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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME      
Net income $ 2,855.6 $ 2,553.0 $ 2,558.4
Commodity derivative instruments:      
Changes in fair value of cash flow hedges (38.5) (193.8) 214.9
Reclassification of losses (gains) to net income 112.2 53.4 (228.2)
Interest rate derivative instruments:      
Changes in fair value of cash flow hedges (5.7) 42.3 0.0
Reclassification of losses to net income 40.4 37.4 35.3
Total cash flow hedges 108.4 (60.7) 22.0
Other (0.1) (0.1) 0.4
Total other comprehensive income (loss) 108.3 (60.8) 22.4
Comprehensive income 2,963.9 2,492.2 2,580.8
Comprehensive income attributable to noncontrolling interests (56.3) (39.9) (37.2)
Comprehensive income attributable to limited partners $ 2,907.6 $ 2,452.3 $ 2,543.6