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Net Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2012
Net Income Per Share  
Net Income Per Share
16. 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, 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.


Years Ended December 31,
2012
2011
2010
(in millions)
Numerator:
Net income (loss)
 $ (1,200.6 ) $ (491.1 ) $ 7.5
Net interest expense on convertible notes and convertible preferred stock dividends (a)
(b)
(b)
 -
Net income (loss) if-converted
$ (1,200.6 ) $ (491.1 ) $ 7.5
Denominator:
Weighted average common shares
124.1 122.5 114.7
Less: Weighted average unvested restricted stock
 2.1 1.7 1.9
Denominator for basic calculation
122.0 120.8 112.8
Weighted average effect of dilutive securities:
Stock compensation awards
- 0.1 0.5
Convertible notes
44.3 44.5 48.1
Convertible preferred stock:
Equivalent common shares (c)
102.7
Less: share issuance limitation (d)
79.9
Net allowable common shares
22.8 19.2 5.2
Subtotal
67.1 63.8 53.8
Less: shares excluded in a period of a net loss or antidilution
 67.1 63.8 -
Weighted average effect of dilutive securities
- - 53.8
Denominator for diluted calculation
122.0 120.8 166.6
Net income (loss) per share – basic
$ (9.84 ) $ (4.07 ) $ .07
Net income (loss) per share – diluted
$ (9.84 ) $ (4.07 ) $ .05
(a) Interest expense on convertible notes and convertible preferred stock dividends net of amount capitalized and net of tax. The total recognized tax benefit is reported at the federal statutory rate net of the tax valuation allowance in 2012. See note (c) below.
(b) No dilutive effect is recognized in a period in which a net loss has occurred. Net interest expense on convertible notes and convertible preferred stock dividends was $19.3 million in 2012 and $4.7 million in 2011.
(c) 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 as determined at the beginning of the period.
(d) 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 USEC's common stock outstanding on May 25, 2010 (approximately 22.8 million shares), 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, and if not limited may result in mandatory prepayment of USEC's credit facility.


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 earnings per share (options and warrants in millions):
Years Ended December 31,
2012
2011
2010
Options excluded from diluted net income per share
2.5
3.1
2.5
Warrants excluded from diluted net income per share
6.3
6.3
2.1
Exercise price of excluded options
$3.72 to
$3.72 to
$5.18 to
$14.28
$14.28
$14.28
Exercise price of excluded warrants
$7.50
$7.50
$7.50