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Income Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Income Per Share
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:
 
Three Months Ended March 31,
Shares in millions
2015
 
2014
Basic weighted average common shares outstanding
145

 
146

Stock options and restricted shares
—

 
—

Diluted weighted average common shares outstanding
145

 
146



For purposes of applying the two-class method in computing earnings (loss) per share, there were $0.3 million net earnings allocated to participating securities, or a negligible amount per share, for the three months ended March 31, 2015, and none for the three months ended March 31, 2014. The diluted earnings (loss) per share calculation did not include 3.5 million and 1.8 million antidilutive weighted average shares for the three months ended March 31, 2015 and March 31, 2014, respectively.