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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED EQUITY (USD $)
In Millions, unless otherwise specified
Total
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interests [Member]
Limited Partners [Member]
Balance at Dec. 31, 2012 $ 13,296.0 $ (370.4) $ 108.3 $ 13,558.1
Increase (Decrease) in Partners' Capital [Roll Forward]        
Net income 755.3 0 1.8 753.5
Cash distributions paid to limited partners (577.6) 0 0 (577.6)
Cash distributions paid to noncontrolling interests (2.4) 0 (2.4) 0
Net cash proceeds from the issuance of common units 554.1 0 0 554.1
Amortization of fair value of equity-based awards 17.1 0 0 17.1
Cash flow hedges (27.7) (27.7) 0 0
Other (24.6) 0 0 (24.6)
Balance at Mar. 31, 2013 13,990.2 (398.1) 107.7 14,280.6
Balance at Dec. 31, 2013 15,440.4 (359.0) 225.6 15,573.8
Increase (Decrease) in Partners' Capital [Roll Forward]        
Net income 806.7 0 7.9 798.8
Cash distributions paid to limited partners (639.2) 0 0 (639.2)
Cash distributions paid to noncontrolling interests (8.0) 0 (8.0) 0
Net cash proceeds from the issuance of common units 83.0 0 0 83.0
Amortization of fair value of equity-based awards 17.4 0 0 17.4
Cash flow hedges 14.7 14.7 0 0
Other (53.0) 0 (2.4) (50.6)
Balance at Mar. 31, 2014 $ 15,662.0 $ (344.3) $ 223.1 $ 15,783.2