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Net Income per Share | 9 Months Ended
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Sep. 30, 2020
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In millions, except net income per share)
Numerator: |  |  |  |  |  |  |
Net income | $ | 185 |  |  | $ | 175 |  |  | $ | 639 |  |  | $ | 569 |
Denominator: |  |  |  |  |  |  |
Shares outstanding at the beginning of the period | 58.7 |  |  | 62.2 |  |  | 61.9 |  |  | 62.1 |
Weighted-average number of shares issued: |  |  |  |  |  |  |
Stock purchases | — |  |  | — |  |  | (2.8) |  |  | — |
Stock-based compensation | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Denominator for basic net income per share | 58.7 |  |  | 62.2 |  |  | 59.2 |  |  | 62.2 |
Effect of dilutive securities: (1) |  |  |  |  |  |  |
Warrants | — |  |  | 0.8 |  |  | — |  |  | 1.8 |
Stock-based compensation | 0.9 |  |  | 0.6 |  |  | 0.8 |  |  | 0.6 |
Denominator for diluted net income per share | 59.6 |  |  | 63.6 |  |  | 60.0 |  |  | 64.6 |
Net income per share - Basic (2) | $ | 3.14 |  |  | $ | 2.81 |  |  | $ | 10.80 |  |  | $ | 9.15 |
Net income per share - Diluted (2) | $ | 3.10 |  |  | $ | 2.75 |  |  | $ | 10.65 |  |  | $ | 8.80 |
______________________________ (1) The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method. All warrants outstanding as of December 31, 2019, were settled in the first quarter of 2020. For more information refer to Note 9, “Stockholders' Equity.” (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=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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