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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, 2023
Share-Based Payment Arrangement [Abstract]  
Shares Under Option, Beginning balance 8.3
Shares Under Option, Granted 1.1
Shares Under Option, Exercised (0.9)
Shares Under Option, Forfeited or canceled (0.1)
Shares Under Option, Ending balance 8.4
Shares Under Option, Exercisable at end of period 2.1
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 60.17
Weighted Average Exercise Price, Forfeited or canceled 127.99
Weighted Average Exercise Price, Ending balance 122.14
Weighted Average Exercise Price, Exercisable at end of year 72.16
Weighted Average Exercise Price, Ending unvested and expected to vest $ 137.06
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 4 months 17 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 21 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 $ 817.6
Aggregate Intrinsic Value, Exercisable at end of year 310.2
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 462.8