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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, 2024
USD ($)
$ / shares
shares
Share-Based Payment Arrangement [Abstract]  
Shares Under Option, Beginning balance | shares 7.9
Shares Under Option, Granted | shares 1.0
Shares Under Option, Exercised | shares (0.7)
Shares Under Option, Ending balance | shares 8.2
Shares Under Option, Exercisable at end of period | shares 2.4
Shares Under Option, Ending unvested and expected to vest | shares 5.2
Weighted Average Exercise Price, Beginning balance | $ / shares $ 123.85
Weighted Average Exercise Price, Granted | $ / shares 243.54
Weighted Average Exercise Price, Exercised | $ / shares 73.33
Weighted Average Exercise Price, Ending balance | $ / shares 143.53
Weighted Average Exercise Price, Exercisable at end of period | $ / shares 88.13
Weighted Average Exercise Price, Ending unvested and expected to vest | $ / shares $ 164.31
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 3 months 18 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 4 months 13 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 5 years 1 month 6 days
Aggregate Intrinsic Value, Ending Balance | $ $ 869.5
Aggregate Intrinsic Value, Exercisable at end of year | $ 384.1
Aggregate Intrinsic Value, Ending unvested and expected to vest | $ $ 448.7