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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
STATEMENTS OF UNAUDITED CONSOLIDATED COMPREHENSIVE INCOME        
Net income $ 621.3 $ 643.1 $ 2,058.3 $ 1,883.3
Commodity derivative instruments:        
Changes in fair value of cash flow hedges (177.8) 22.7 (2.6) (52.2)
Reclassification of gains to net income (10.1) (26.9) (49.0) (48.7)
Interest rate derivative instruments:        
Changes in fair value of cash flow hedges (0.3) (6.9) (4.8) (16.3)
Reclassification of losses to net income 10.3 9.4 29.9 27.8
Total cash flow hedges (177.9) (1.7) (26.5) (89.4)
Other 0.0 0.0 (0.1) (0.1)
Total other comprehensive loss (177.9) (1.7) (26.6) (89.5)
Comprehensive income 443.4 641.4 2,031.7 1,793.8
Comprehensive income attributable to noncontrolling interests (10.4) (8.5) (33.0) (29.0)
Comprehensive income attributable to limited partners $ 433.0 $ 632.9 $ 1,998.7 $ 1,764.8