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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Initial Public Offering
 
Issuance of common units, tax impact $ 148.0
Underwritten Offering
 
Issuance of common units, tax impact 96.0
Private placement
 
Issuance of common units, tax impact 15.2
Secondary Offering
 
Issuance of common units, tax impact $ 88.5