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Net Income Per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The following table sets forth the calculation of basic and diluted net income per share:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
| (In millions, except net income per share)
Numerator: |  |  |  |  |
Net income | $ | 659 |  |  | $ | 673 |  |  | $ | 737 |
Denominator: |  |  |  |  |
Shares outstanding at the beginning of the period | 58.0 |  |  | 61.9 |  |  | 62.1 |
Weighted-average number of shares issued: |  |  |  |  |
Stock purchases | (0.5) |  |  | (3.0) |  |  | — |
Stock-based compensation | 0.3 |  |  | 0.1 |  |  | 0.1 |
Denominator for basic net income per share | 57.8 |  |  | 59.0 |  |  | 62.2 |
Effect of dilutive securities: (1) |  |  |  |  |
Stock-based compensation | 0.8 |  |  | 0.9 |  |  | 0.6 |
Warrants | — |  |  | — |  |  | 1.4 |
Denominator for diluted net income per share | 58.6 |  |  | 59.9 |  |  | 64.2 |
Net income per share - Basic (2) | $ | 11.40 |  |  | $ | 11.40 |  |  | $ | 11.85 |
Net income per share - Diluted (2) | $ | 11.25 |  |  | $ | 11.23 |  |  | $ | 11.47 |
_______________________________ (1) The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income per share because to do so would have been anti-dilutive.(2) Source data for calculations in thousands.

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