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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, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares Under Option, Beginning balance 7.5
Shares Under Option, Granted 1.6
Shares Under Option, Exercised (1.1)
Shares Under Option, Forfeited or canceled (0.1)
Shares Under Option, Ending balance 7.9
Shares Under Option, Exercisable at end of year 2.3
Shares Under Option, Ending unvested and expected to vest 5.1
Weighted Average Exercise Price, Beginning balance $ 65.09
Weighted Average Exercise Price, Granted 127.90
Weighted Average Exercise Price, Exercised 49.30
Weighted Average Exercise Price, Forfeited or canceled 86.21
Weighted Average Exercise Price, Ending balance 80.17
Weighted Average Exercise Price, Exercisable at end of year 51.05
Weighted Average Exercise Price, Ending unvested and expected to vest $ 91.53
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 18 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 1 year 9 months 3 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 4 years 11 months 19 days
Aggregate Intrinsic Value, Ending Balance $ 539.1
Aggregate Intrinsic Value, Exercisable at end of year 228.0
Aggregate Intrinsic Value, Ending unvested and expected to vest $ 293.8