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Net Income per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Income per Share | Net Income per Share The following table sets forth the calculation of net income per share:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (In millions, except net income per share)
Numerator: |  |  |  |  |  |  |
Net income | $ | 143 |  |  | $ | 185 |  |  | $ | 556 |  |  | $ | 639 |
Denominator: |  |  |  |  |  |  |
Shares outstanding at the beginning of the period | 57.8 |  |  | 58.7 |  |  | 58.0 |  |  | 61.9 |
Weighted-average number of shares issued: |  |  |  |  |  |  |
Stock purchases | — |  |  | — |  |  | (0.5) |  |  | (2.8) |
Stock-based compensation | — |  |  | — |  |  | 0.3 |  |  | 0.1 |
Denominator for basic net income per share | 57.8 |  |  | 58.7 |  |  | 57.8 |  |  | 59.2 |
Effect of dilutive securities: (1) |  |  |  |  |  |  |
Stock-based compensation | 0.7 |  |  | 0.9 |  |  | 0.7 |  |  | 0.8 |
Denominator for diluted net income per share | 58.5 |  |  | 59.6 |  |  | 58.5 |  |  | 60.0 |
Net income per share - Basic (2) | $ | 2.49 |  |  | $ | 3.14 |  |  | $ | 9.63 |  |  | $ | 10.80 |
Net income per share - Diluted (2) | $ | 2.46 |  |  | $ | 3.10 |  |  | $ | 9.51 |  |  | $ | 10.65 |
______________________________ (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 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=124432515&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=124432515&loc=d3e3630-109257 + Details
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