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Income Per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Income Per Share | 19. Income (Loss) per Share Basic income (loss) per share is based upon the weighted average number of common shares outstanding during the period. Dilutive income (loss) per share includes additional common shares that would have been outstanding if potential common shares with a dilutive effect had been issued using the treasury stock method. A reconciliation of the number of shares used for the basic and diluted income (loss) per share calculations is as follows:
| Years ended December 31,
Shares in millions | 2015 |  | 2014 |  | 2013
Basic weighted average common shares outstanding | 144 |  |  | 146 |  |  | 148 |
Stock options and restricted shares | — |  |  | — |  |  | 1 |
Diluted weighted average common shares outstanding | 144 |  |  | 146 |  |  | 149 |
For purposes of applying the two-class method in computing earnings (loss) per share, net earnings allocated to participating securities was approximately $1.7 million, or $0.01 per share, for the fiscal year 2015, none for fiscal year 2014 and $0.3 million, or a negligible amount per share, for fiscal year 2013. The diluted earnings (loss) per share calculation did not include 3.4 million, 3.0 million and 1.8 million antidilutive weighted average shares for the years ended December 31, 2015, 2014 and 2013, respectively.

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