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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Abstract]    
Trade payables $ 8.7 $ 21.1
Compensation and benefits payable 27.3 41.0
American Centrifuge accrued liabilities 4.6 13.3
Accrued property and other taxes payable 3.2 4.7
Accrued lease turnover - current 30.4 32.2
Accrued interest payable on debt 4.0 5.3
Accrued severance payments 21.2 0
Other accrued liabilities 15.1 28.2
Accounts payable and accrued liabilities $ 114.5 $ 145.8