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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME    
Net income $ 655.5 $ 434.5
Commodity derivative instruments:    
Changes in fair value of cash flow hedges (59.6) (151.4)
Reclassification of gains and losses to net income 22.0 68.9
Interest rate derivative instruments:    
Changes in fair value of cash flow hedges 28.9 14.1
Reclassification of gains and losses to net income 2.7 1.5
Total cash flow hedges (6.0) (66.9)
Change in funded status of pension and postretirement plans, net of tax (1.2) 0.3
Proportionate share of other comprehensive income (loss) of unconsolidated affiliate 1.0 (1.0)
Change in fair value of available-for-sale equity securities 15.8 0
Total other comprehensive income (loss) 9.6 (67.6)
Comprehensive income 665.1 366.9
Comprehensive income attributable to noncontrolling interests (4.2) (13.8)
Comprehensive income attributable to limited partners $ 660.9 $ 353.1