| Net Income Per Share The calculations of basic and diluted net income per share are as follows: | | | | | | | | | | | | | | | | | Three Months Ended March 31, | | (In millions, except per share data) | | 2026 | | 2025 | | Net income - basic and diluted | | $ | 727.2 | | | $ | 808.7 | | | | | | | | Weighted average shares - basic | | 104.0 | | | 106.7 | | | Effect of dilutive securities: | | | | | | Stock options | | 2.6 | | | 2.5 | | | Restricted stock awards and restricted stock units | | 1.1 | | | 2.0 | | | Weighted average shares - diluted | | 107.7 | | | 111.2 | | | | | | | | Net income per share - basic | | $ | 6.99 | | | $ | 7.58 | | | Net income per share - diluted | | $ | 6.75 | | | $ | 7.27 | |
Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the following: | | | | | | | | | | | | | | | | | Three Months Ended March 31, | | (Shares in millions) | | 2026 | | 2025 | | Stock options | | 3.7 | | | 4.8 | | Restricted stock awards and restricted stock units | | — | | | 1.0 | |
|