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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Components of Basic and Diluted Earnings Per Share | The components of basic and diluted earnings per share are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
In millions, except per share amounts | 2021 |  | 2020 |  | 2021 |  | 2020
Net income (loss) attributable to common stockholders | $ | 44 |  |  | $ | (43) |  |  | $ | 97 |  |  | $ | 125 |
Weighted average outstanding shares of common stock | 109.0 |  |  | 108.5 |  |  | 108.9 |  |  | 109.4 |
Dilutive effect of employee stock options, restricted stock and other stock awards | 3.7 |  |  | — |  |  | 3.8 |  |  | 1.2 |
Common stock and common stock equivalents | 112.7 |  |  | 108.5 |  |  | 112.7 |  |  | 110.6 |
Net income (loss) per share: |  |  |  |  |  |  |
Basic | $ | 0.40 |  |  | $ | (0.40) |  |  | $ | 0.89 |  |  | $ | 1.14 |
Diluted | $ | 0.39 |  |  | $ | (0.40) |  |  | $ | 0.86 |  |  | $ | 1.13 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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