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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Shares Under Option, Beginning balance 8.3
Shares Under Option, Granted 1.1
Shares Under Option, Exercised (1.1)
Shares Under Option, Forfeited or canceled (0.1)
Shares Under Option, Ending balance 8.2
Shares Under Option, Exercisable at end of period 1.9
Shares Under Option, Ending unvested and expected to vest 5.6
Weighted Average Exercise Price, Beginning balance $ 107.47
Weighted Average Exercise Price, Granted 177.78
Weighted Average Exercise Price, Exercised 61.24
Weighted Average Exercise Price, Forfeited or canceled 131.67
Weighted Average Exercise Price, Ending balance 123.32
Weighted Average Exercise Price, Exercisable at end of year 72.7
Weighted Average Exercise Price, Ending unvested and expected to vest $ 137.07
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 2 months 8 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 1 year 10 months 9 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 4 years 10 months 6 days
Aggregate Intrinsic Value, Ending Balance $ 855.9
Aggregate Intrinsic Value, Exercisable at end of year 298.0
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 512.7