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Income (loss) per Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Income (loss) 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 per share calculations is as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
Shares in millions | 2021 |  | 2020 |  | 2021 |  | 2020
Basic weighted average common shares outstanding | 141 |  |  | 142 |  |  | 141 |  |  | 142 |
Stock options, restricted shares, and convertible debt | — |  |  | — |  |  | — |  |  | — |
Diluted weighted average common shares outstanding | 141 |  |  | 142 |  |  | 141 |  |  | 142 |
For purposes of applying the two-class method in computing income (loss) per share, there were no net earnings allocated to participating securities, or a negligible amount per share for the three and six months ended June 30, 2021. There were no net earnings allocated to participating securities for the three and six months ended June 30, 2020. The diluted income per share calculation did not include antidilutive weighted average shares for three months ended June 30, 2021, and 0.2 million antidilutive weighted average shares for the six months ended June 30, 2021. The diluted income (loss) per share calculation did not include 1.2 million antidilutive weighted average shares for the three and six months ended June 30, 2020.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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