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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Disclosures [Abstract] |
Schedule of Financial Instruments Recorded at Fair Value | Financial Instruments Recorded at Fair Value
| Fair Value Measurements (in millions)
| March 31, 2014 |  | December 31, 2013
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents (a) | — |  |  | $ | 80.1 |  |  | — |  |  | $ | 80.1 |  |  | — |  |  | $ | 312.7 |  |  | — |  |  | $ | 312.7 |
Deferred compensation asset (b) | — |  |  | 3.1 |  |  | — |  |  | 3.1 |  |  | — |  |  | 3.1 |  |  | — |  |  | 3.1 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation obligation (b) | — |  |  | 2.9 |  |  | — |  |  | 2.9 |  |  | — |  |  | 3.0 |  |  | — |  |  | 3.0 |
(a) | Cash equivalents consist of funds invested in institutional money market funds. These investments are classified within Level 2 of the valuation hierarchy because the publicly reported Net Asset Value (“NAV”) of one dollar does not necessarily reflect the fair value of the underlying securities.
(b) | The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is informally funded through a rabbi trust using variable universal life insurance. The cash surrender value of the life insurance policies is designed to track the deemed investments of the plan participants. Investment crediting options consist of institutional and retail investment funds. The deemed investments are classified within Level 2 of the valuation hierarchy because (i) of the indirect method of investing and (ii) unit prices of institutional funds are not quoted in active markets.
Schedule of Fair Value of Debt | The balance sheet carrying amounts and estimated fair values of USEC’s convertible senior notes follow (in millions):
| March 31, 2014 |  | December 31, 2013
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Convertible senior notes, excluding accrued interest | $ | 530.0 |  |  | $ | 185.5 |  |  | $ | 530.0 |  |  | $ | 184.1 |

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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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: 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=25499696&loc=d3e19190-110258 Reference 3: 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=25499696&loc=d3e19207-110258 + Details
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