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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Related Party Transactions    
Payable to related parties, current $ 15.8 $ 33.2
Affiliate partners
   
Related Party Transactions    
Receivables from related parties 40.5 41.3
Receivable from related parties, included in Prepaid expenses and other current assets 3.0 1.4
Receivable from related parties, included in Other Assets 37.5 39.9
Payable to related parties, current 15.8 33.2
Payable to related parties, included in Other long-term liabilities 118.1 114.3
Payable to related parties $ 133.9 $ 147.5