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Related Party Transactions (Details) (Affiliate partners [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Member]
   
Related Party Transactions    
Payable to related parties $ 23.6 $ 13.2
Other Assets [Member]
   
Related Party Transactions    
Receivables from related parties 21.8 36.9
Other Liabilities [Member]
   
Related Party Transactions    
Payable to related parties $ 133.4 $ 133.6