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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Shares Under Option, Beginning balance 7.9
Shares Under Option, Granted 1.0
Shares Under Option, Exercised (1.0)
Shares Under Option, Forfeited or canceled (0.1)
Shares Under Option, Ending balance 7.8
Shares Under Option, Exercisable at end of period 2.1
Shares Under Option, Ending unvested and expected to vest 5.2
Weighted Average Exercise Price, Beginning balance $ 123.85
Weighted Average Exercise Price, Granted 243.54
Weighted Average Exercise Price, Exercised 76.4
Weighted Average Exercise Price, Forfeited or canceled 151.05
Weighted Average Exercise Price, Ending balance 145.7
Weighted Average Exercise Price, Exercisable at end of period 88.79
Weighted Average Exercise Price, Ending unvested and expected to vest $ 164.5
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 2 months 4 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 2 months 8 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 4 years 10 months 9 days
Aggregate Intrinsic Value, Ending Balance $ 883.9
Aggregate Intrinsic Value, Exercisable at end of year 353.9
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 494.1