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Accounts Payable and Accrued Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued liabilities for lease turnover costs, total $ 42.5  
Accrued liabilities for lease turnover costs, noncurrent 10.3 42.6
Accrued liabilities for lease turnover costs, current $ 32.2