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Net Income per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Summary of denominators for the computation of basic and diluted earnings per share | The following table sets forth the calculation of net income per share:
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
| (In millions, except net income per share)
Numerator: |  |  |  |  |  |  |
Net income | $ | 228 |  |  | $ | 178 |  |  |  |  |
Denominator: |  |  |  |  |  |  |
Shares outstanding at the beginning of the period | 58.0 |  |  | 61.9 |  |  |  |  |
Weighted-average number of shares issued: |  |  |  |  |  |  |
Stock purchases | (0.4) |  |  | (1.7) |  |  |  |  |
Stock-based compensation | 0.1 |  |  | — |  |  |  |  |
Denominator for basic net income per share | 57.7 |  |  | 60.2 |  |  |  |  |
Effect of dilutive securities: (1) |  |  |  |  |  |  |
Stock-based compensation | 0.9 |  |  | 0.7 |  |  |  |  |
Other | — |  |  | 0.1 |  |  |  |  |
Denominator for diluted net income per share | 58.6 |  |  | 61.0 |  |  |  |  |
Net income per share - Basic (2) | $ | 3.95 |  |  | $ | 2.95 |  |  |  |  |
Net income per share - Diluted (2) | $ | 3.89 |  |  | $ | 2.92 |  |  |  |  |
______________________________ (1) The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method. (2) Source data for calculations in thousands.

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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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