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Net Income Per Share | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The calculations of basic and diluted net income per share are as follows:
|  | Year Ended December 31,
(In millions, except per share data) |  | 2022 |  | 2021 |  | 2020
Net income - basic and diluted |  | $ | 4,338.4 |  |  | $ | 8,075.3 |  |  | $ | 3,513.2 |
Weighted average shares - basic |  | 107.1 |  |  | 105.7 |  |  | 107.6 |
Effect of dilutive securities: |  |  |  |  |  |
Stock options |  | 4.9 |  |  | 5.4 |  |  | 7.0 |
Restricted stock awards and restricted stock units |  | 1.5 |  |  | 1.1 |  |  | 0.5 |
Weighted average shares - diluted |  | 113.5 |  |  | 112.2 |  |  | 115.1 |
Net income per share - basic |  | $ | 40.51 |  |  | $ | 76.40 |  |  | $ | 32.65 |
Net income per share - diluted |  | $ | 38.22 |  |  | $ | 71.97 |  |  | $ | 30.52 |
Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the following:
|  | Year Ended December 31,
(Shares in millions) |  | 2022 |  | 2021 |  | 2020
Stock options |  | 2.3 |  |  | 2.9 |  |  | 2.7 |

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