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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2013
Fair Value Disclosures [Abstract] |
Schedule of Financial Instruments Recorded at Fair Value | Financial Instruments Recorded at Fair Value
| Fair Value Measurements (in millions)
| June 30, 2013 |  | December 31, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents (a) | — |  |  | $ | 194.5 |  |  | — |  |  | $ | 194.5 |  |  | — |  |  | $ | 292.2 |  |  | — |  |  | $ | 292.2 |
Deferred compensation asset (b) | — |  |  | 2.8 |  |  | — |  |  | 2.8 |  |  | — |  |  | 2.7 |  |  | — |  |  | 2.7 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation obligation (b) | — |  |  | 2.7 |  |  | — |  |  | 2.7 |  |  | — |  |  | 2.7 |  |  | — |  |  | 2.7 |
Schedule of Fair Value of Debt | The balance sheet carrying amounts and estimated fair values of USEC’s debt follow (in millions):
| June 30, 2013 |  | December 31, 2012
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Credit facility term loan | $ | — |  |  | $ | — |  |  | $ | 83.2 |  |  | $ | 93.5 |
Convertible preferred stock and accrued dividends payable-in-kind | 107.0 |  |  | 107.0 |  |  | 100.5 |  |  | 100.5 |
3.0% convertible senior notes, due October 1, 2014 | 530.0 |  |  | 119.3 |  |  | 530.0 |  |  | 198.2 |

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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