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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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 | 2018 |  | 2017 |  | 2018 |  | 2017
Net income attributable to common stockholders | $ | 18 |  |  | $ | 13 |  |  | $ | 15 |  |  | $ | 7 |
Weighted average outstanding shares of common stock | 118.7 |  |  | 123.7 |  |  | 119.9 |  |  | 127.3 |
Dilutive effect of employee stock options, restricted stock and other stock awards | 2.0 |  |  | 2.1 |  |  | 1.9 |  |  | 1.8 |
Common stock and common stock equivalents | 120.7 |  |  | 125.8 |  |  | 121.8 |  |  | 129.1 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.15 |  |  | $ | 0.11 |  |  | $ | 0.13 |  |  | $ | 0.05 |
Diluted | $ | 0.15 |  |  | $ | 0.10 |  |  | $ | 0.12 |  |  | $ | 0.05 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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