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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Stock Plans |
Schedule of stock options activity |
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (millions)
Balance at December 31, 2023 (2,211,566 shares exercisable) |  | 5,118,992 |  |  | $ | 103.65 |  |  |  |  |
Granted |  | 562,785 |  |  | $ | 104.28 |  |  |  |  |
Exercised |  | (258,606 | ) |  | $ | 105.05 |  |  |  |  |
Forfeited/Canceled |  | (260,118 | ) |  | $ | 135.60 |  |  |  |  |
Expired |  | (1,389 | ) |  | $ | 149.99 |  |  |  |  |
Balance at December 31, 2024 |  | 5,161,664 |  |  | $ | 104.10 |  |  | 6.3 |  | $ | 33.8 |
Exercisable at December 31, 2024 |  | 3,740,436 |  |  | $ | 106.25 |  |  | 5.3 |  | $ | 25.1 |
Vested and expected to vest at December 31, 2024 |  | 5,047,966 |  |  | $ | 103.61 |  |  | 6.5 |  | $ | 26.7 |
Schedule of the fair value using the Black-Scholes-Merton option-pricing model or Monte Carlo simulation model |
|  | Year ended December 31,
|  | 2024 |  | 2023 |  | 2022
Volatility |  | 42.36 | % |  | 42.5 | % |  | 42.4 | %
Risk-free interest rate - weighted average |  | 4.09 | % |  | 4.23 | % |  | 3.97 | %
Risk-free interest rate - range |  | 4.09% to 4.31% |  |  | 4.23 | % |  | 3.97% to 3.45 | %
Dividend yield |  | — | % |  | — | % |  | — | %
Assumed forfeitures |  | 8.0 | % |  | 8.0 | % |  | 8.0 | %
Expected lives |  | 5.0 years |  |  | 5.0 years |  |  | 4.6 years |
Weighted-average fair value (per option) |  | $ | 43.42 |  |  | $ | 39.43 |  |  | $ | 37.15 |
Schedule of restricted stock activity |
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023 |  | 766,702 |  |  | $ | 104.65 |
Granted |  | 322,899 |  |  | $ | 105.08 |
Vested |  | 177,101 |  |  | $ | 116.53 |
Forfeited |  | 83,145 |  |  | $ | 135.07 |
Nonvested at December 31, 2024 |  | 829,355 |  |  | $ | 97.11 |

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