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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Related Party Transactions    
Payable to related parties, current $ 17.1 $ 33.2
Affiliate partners
   
Related Party Transactions    
Receivables from related parties 40.0 41.3
Receivable from related parties, included in Prepaid expenses and other current assets 1.5 1.4
Receivable from related parties, included in Other Assets 38.5 39.9
Payable to related parties, current 17.1 33.2
Payable to related parties, included in Other long-term liabilities 115.1 114.3
Payable to related parties $ 132.2 $ 147.5