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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
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 September 30, |  | Nine Months Ended September 30,
In millions, except per share amounts | 2020 |  | 2019 |  | 2020 |  | 2019
Net (loss) income attributable to common stockholders | $ | (1) |  |  | $ | 10 |  |  | $ | 124 |  |  | $ | (1) |
Weighted average outstanding shares of common stock | 109.1 |  |  | 113.2 |  |  | 109.3 |  |  | 115.2 |
Dilutive effect of employee stock options, restricted stock and other stock awards | — |  |  | 1.0 |  |  | 1.6 |  |  | — |
Common stock and common stock equivalents | 109.1 |  |  | 114.2 |  |  | 110.9 |  |  | 115.2 |
Net (loss) income per share: |  |  |  |  |  |  |
Basic | $ | (0.01) |  |  | $ | 0.09 |  |  | $ | 1.13 |  |  | $ | (0.01) |
Diluted | $ | (0.01) |  |  | $ | 0.09 |  |  | $ | 1.12 |  |  | $ | (0.01) |

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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=6371337&loc=d3e3550-109257 + Details
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