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Income Per Share | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Income Per Share | 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:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
Shares in millions | 2015 |  | 2014 |  | 2015 |  | 2014
Basic weighted average common shares outstanding | 144 |  |  | 145 |  |  | 144 |  |  | 146 |
Stock options and restricted shares | — |  |  | — |  |  | — |  |  | — |
Diluted weighted average common shares outstanding | 144 |  |  | 145 |  |  | 144 |  |  | 146 |
For purposes of applying the two-class method in computing income (loss) per share, there were $0.6 million and $0.9 million net earnings allocated to participating securities, or a negligible amount per share, for the three and six months ended June 30, 2015, respectively. There were no net earnings allocated to participating securities for each of the three and six months ended June 30, 2014. The diluted income (loss) per share calculation did not include 3.8 million and 3.6 million antidilutive weighted average shares for the three and six months ended June 30, 2015, respectively. The diluted income (loss) per share calculation did not include 3.1 million and 2.5 million antidilutive weighted average shares for the three and six months ended June 30, 2014, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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