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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities    
Accrued compensation $ 138.8 $ 136.2
Accrued professional fees 28.7 24.3
Accrued interest 19.3 15.9
Accrued distributions 13.2 25.0
Accounts payable 59.5 90.1
Other 65.2 52.1
Accounts payable and accrued liabilities $ 324.7 $ 343.6