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Net Income Per Share | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | NET INCOME (LOSS) PER SHARE Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period, excluding any unvested restricted stock. In calculating diluted net income per share, the numerator is increased by interest expense on the convertible notes and convertible preferred stock dividends, net of amount capitalized and net of tax, and the denominator is increased by the weighted average number of shares resulting from potentially dilutive securities, assuming full conversion, consisting of stock compensation awards, convertible notes, convertible preferred stock and warrants. No dilutive effect is recognized in a period in which a net loss has occurred or in which the assumed conversion effect of convertible securities is antidilutive. On July 1, 2013, USEC effectuated a reverse stock split of 1-for-25 shares in order to regain compliance with the NYSE continued listing criteria related to minimum share price. Net income (loss) per share was adjusted for all periods presented to reflect the change in the number of shares.
| Years Ended December 31,
| 2013 |  | 2012 |  | 2011
| (millions)
Numerators for basic and diluted calculations (a): |  |  |  |  |
Net (loss) from continuing operations | $ | (183.6 | ) |  | $ | (1,201.8 | ) |  | $ | (491.8 | )
Net income from discontinued operations | 24.7 |  |  | 1.2 |  |  | 0.7 |
Net (loss) | $ | (158.9 | ) |  | $ | (1,200.6 | ) |  | $ | (491.1 | )
Denominator: |  |  |  |  |  |
Weighted average common shares | 5.0 |  |  | 5.0 |  |  | 4.9 |
Less: Weighted average unvested restricted stock | 0.1 |  |  | 0.1 |  |  | 0.1 |
Denominator for basic calculation | 4.9 |  |  | 4.9 |  |  | 4.8 |
Weighted average effect of dilutive securities: |  |  |  |  |  |
Convertible notes | 1.8 |  |  | 1.8 |  |  | 1.8 |
Convertible preferred stock: |  |  |  |  |  |  |  |
Equivalent common shares (b) | 10.3 |  |  | 4.1 |  |  | 0.8 |
Less: share issuance limitation (c) | 9.4 |  |  | 3.2 |  |  | — |
Net allowable common shares | 0.9 |  |  | 0.9 |  |  | 0.8 |
Subtotal | 2.7 |  |  | 2.7 |  |  | 2.6 |
Less: shares excluded in a period of a net loss or antidilution | 2.7 |  |  | 2.7 |  |  | 2.6 |
Weighted average effect of dilutive securities | — |  |  | — |  |  | — |
Denominator for diluted calculation | 4.9 |  |  | 4.9 |  |  | 4.8 |
Net (loss) per share from continuing operations – basic and diluted | $ | (37.47 | ) |  | $ | (245.26 | ) |  | $ | (102.46 | )
Net income per share from discontinued operations – basic and diluted | $ | 5.04 |  |  | $ | 0.24 |  |  | $ | 0.15 |
Net (loss) per share – basic and diluted | $ | (32.43 | ) |  | $ | (245.02 | ) |  | $ | (102.31 | )
(a) | The numerators are subject to increase for interest expense on convertible notes and convertible preferred stock dividends, net of tax, of $20.3 million in 2013, $19.3 million in 2012 and $4.7 million in 2011. The tax rate is the statutory rate. However, no dilutive effect is recognized in a period in which a net loss has occurred. In addition, for purposes of calculating income from discontinued operations per share, the calculation of (loss) from continuing operations per share provides a control number in determining whether potential common shares are dilutive or antidilutive. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss (discontinued operations and net income/loss), regardless of their antidilutive effect on such categories. Therefore, no dilutive effect is recognized in the calculation of income from discontinued operations per share.
(b) | The number of equivalent common shares for the convertible preferred stock is based on the arithmetic average of the daily volume weighted average prices per share of common stock for each of the last 20 trading days, and is determined as of the beginning of the period for purposes of calculating diluted net income per share.
(c) | Prior to obtaining shareholder approval, the preferred stock may not be converted into an aggregate number of shares of common stock in excess of 19.99% of the shares of our common stock outstanding on May 25, 2010 (approximately 0.9 million shares adjusted to take into account the 1-for-25 reverse stock split), in compliance with the rules of the New York Stock Exchange. If a share issuance limitation were to exist at the time of share conversion or sale, any preferred stock shares subject to the share issuance limitation would be subject to optional or mandatory redemption for, at USEC's option, cash or SWU consideration. However, USEC’s ability to redeem may be limited by Delaware law.
Options and warrants to purchase shares of common stock having an exercise price greater than the average share market price are excluded from the calculation of diluted net income per share:
| Years Ended December 31, |
| 2013 |  |  | 2012 |  |  | 2011 |
Options excluded from diluted net income per share | 1,000 |  |  |  | 111,000 |  |  |  | 125,000 |  |
Warrants excluded from diluted net income per share | 250,000 |  |  |  | 250,000 |  |  |  | 250,000 |  |
Exercise price of excluded options | $ | 177.50 |  | to |  | $ | 93.00 |  | to |  | $ | 93.00 |  | to
| $ | 357.00 |  |  |  | $ | 357.00 |  |  |  | $ | 357.00 |  |
Exercise price of excluded warrants | $ | 187.50 |  |  |  | $ | 187.50 |  |  |  | $ | 187.50 |  |
In January 2013, the Compensation Committee of the Board of Directors approved the surrender and cancellation of unexercised stock options held by employees. The remaining options are held by non-employee directors.

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