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UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED EQUITY (USD $)
In Millions, unless otherwise specified
Limited Partners [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interests [Member]
Total
Balance at Dec. 31, 2011 $ 12,464.8 $ (351.4) $ 105.9 $ 12,219.3
Increase (Decrease) in Partners' Capital [Roll Forward]        
Net income 1,217.6 0 5.1 1,222.7
Cash distributions paid to limited partners (1,068.6) 0 0 (1,068.6)
Cash distributions paid to noncontrolling interests 0 0 (8.1) (8.1)
Cash contributions from noncontrolling interests 0 0 5.9 5.9
Net cash proceeds from the issuance of common units 61.5 0 0 61.5
Amortization of fair value of equity-based awards 31.8 0 0 31.8
Cash flow hedges 0 32.9 0 32.9
Other (22.1) (0.2) 1.0 (21.3)
Balance at Jun. 30, 2012 12,685.0 (318.7) 109.8 12,476.1
Balance at Dec. 31, 2012 13,558.1 (370.4) 108.3 13,296.0
Increase (Decrease) in Partners' Capital [Roll Forward]        
Net income 1,306.0 0 2.6 1,308.6
Cash distributions paid to limited partners (1,171.9) 0 0 (1,171.9)
Cash distributions paid to noncontrolling interests 0 0 (4.7) (4.7)
Cash contributions from noncontrolling interests 0 0 95.9 95.9
Net cash proceeds from the issuance of common units 835.4 0 0 835.4
Amortization of fair value of equity-based awards 35.6 0 0 35.6
Cash flow hedges 0 7.0 0 7.0
Other (44.3) 0.4 (5.2) (49.1)
Balance at Jun. 30, 2013 $ 14,518.9 $ (363.0) $ 196.9 $ 14,352.8