Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Debt (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Convertible senior notes [Member]	Dec. 31, 2011 Credit facility, prior [Member]	Sep. 30, 2012 Credit facility, amended and restated [Member]
Revolving credit facility						$ 150.0
Credit facility term loan		85.0	85.0			85.0
Convertible senior notes		530.0	530.0	530.0
Debt instrument interest rate				3.00%
Debt instrument, interest rate at period end						10.50%
Debt instrument maturity date				Oct. 01, 2014	May 31, 2012
Line of credit facility, maximum borrowing capacity					310.0	235.0
Letters of credit, capacity						75.0
Debt conversion, converted instrument, amount	45.0
Debt conversion, converted instrument, shares issued	6,952,500
Gain on extinguishment of debt	3.1
Monthly reduction in credit facility effective December 2012						5.0
Maximum USEC share for RD&D Program under credit facility						75.0
Maximum unreimbursed expenditures under credit facility						50.0
Maximum aggregate American Centrifuge expenditures after June 1, 2012 under credit facility						375.0
Availability block						45.0
Optional cash collateral						$ 25.0