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Earnings per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share Basic earnings per share is calculated by dividing net income by the weighted average number of shares outstanding during the reported period. The calculation of diluted earnings per share is similar to basic earnings per share, except that the weighted average number of shares outstanding includes the dilution from potential shares resulting from stock options, restricted stock awards and other stock awards. The components of basic and diluted earnings per share are as follows:
| Three Months Ended March 31, |  |
In millions, except per share amounts | 2021 |  | 2020 |  |  |  |
Net income attributable to common stockholders | $ | 53 |  |  | $ | 168 |  |  |  |  |
Weighted average outstanding shares of common stock | 108.7 |  |  | 110.3 |  |  |  |  |
Dilutive effect of employee stock options, restricted stock and other stock awards | 4.1 |  |  | 1.0 |  |  |  |  |
Common stock and common stock equivalents | 112.8 |  |  | 111.3 |  |  |  |  |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 0.49 |  |  | $ | 1.52 |  |  |  |  |
Diluted | $ | 0.47 |  |  | $ | 1.51 |  |  |  |  |
Options to purchase 1.2 million shares of common stock for the three months ended March 31, 2021 and 2.2 million shares of common stock for the three months ended March 31, 2020 were not included in the computation of diluted earnings per share because the exercise prices of these options were greater than the average market price of the common shares for the period, and therefore would have been anti-dilutive.

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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=6371337&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=6371337&loc=d3e3630-109257 + Details
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