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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 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Shares Under Option    
Shares Under Option, Beginning balance (in shares) | shares   7.3
Shares Under Option, Granted (in shares) | shares   0.8
Shares Under Option, Exercised (in shares) | shares   (1.1)
Shares Under Option, Forfeited or canceled (in shares) | shares   (0.2)
Shares Under Option, Ending balance (in shares) | shares 6.8 6.8
Shares Under Option, Exercisable at end of period (in shares) | shares 2.3 2.3
Shares Under Option, Ending unvested and expected to vest (in shares) | shares 4.3 4.3
Weighted Average Exercise Price    
Weighted Average Exercise Price, Beginning balance (in dollars per share) | $ / shares   $ 148.26
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares   337.75
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares   105.16
Weighted Average Exercise Price, Forfeited or canceled (in dollars per share) | $ / shares   192.52
Weighted Average Exercise Price, Ending balance (in dollars per share) | $ / shares $ 176.74 176.74
Weighted Average Exercise Price, Exercisable at end of period (in dollars per share) | $ / shares 110.63 110.63
Weighted Average Exercise Price, Ending unvested and expected to vest (in dollars per share) | $ / shares $ 206.32 $ 206.32
Weighted Average Remaining Contractual Term (in years), Ending balance 3 years 7 months 28 days 3 years 7 months 28 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year   1 year 11 months 8 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest   4 years 5 months 12 days
Aggregate Intrinsic Value, Ending Balance | $ $ 932.8 $ 932.8
Aggregate Intrinsic Value, Exercisable at end of year | $ 448.8 448.8
Aggregate Intrinsic Value, Ending unvested and expected to vest | $ $ 459.3 $ 459.3