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Accounts Payable and Accrued Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities, Current [Abstract]
Trade payables	$ 20.2	$ 36.3
Compensation and benefits	45.2	61.3
American Centrifuge accrued liabilities	11.0	14.5
Accrued property and other taxes payable	10.9	9.8
Accrued lease turnover - current		10.5
Accrued interest payable on debt	4.7	5.3
Other accrued liabilities	28.1	34.7
Accounts payable and accrued liabilities	$ 120.1	$ 172.4

Carrying value as of the balance sheet date of obligations incurred and payable, which are not elsewhere specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details