Income Per Share

12 Months Ended

Dec. 31, 2015

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.