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Stock Option Plans - Stock Option Activity and Related Information (Detail)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
$ / shares
shares
Share-Based Payment Arrangement [Abstract]  
Shares Under Option, Beginning balance | shares 7.3
Shares Under Option, Granted | shares 0.8
Shares Under Option, Exercised | shares (0.7)
Shares Under Option, Forfeited or canceled | shares (0.1)
Shares Under Option, Ending balance | shares 7.3
Shares Under Option, Exercisable at end of period | shares 2.6
Shares Under Option, Ending unvested and expected to vest | shares 4.3
Weighted Average Exercise Price, Beginning balance | $ / shares $ 148.26
Weighted Average Exercise Price, Granted | $ / shares 337.74
Weighted Average Exercise Price, Exercised | $ / shares 105.94
Weighted Average Exercise Price, Forfeited or canceled | $ / shares 181.36
Weighted Average Exercise Price, Ending balance | $ / shares 173.78
Weighted Average Exercise Price, Exercisable at end of period | $ / shares 109.41
Weighted Average Exercise Price, Ending unvested and expected to vest | $ / shares $ 205.82
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 29 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 4 months 20 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 4 years 11 months 12 days
Aggregate Intrinsic Value, Ending Balance | $ $ 1,259.8
Aggregate Intrinsic Value, Exercisable at end of year | $ 608.9
Aggregate Intrinsic Value, Ending unvested and expected to vest | $ $ 601.4