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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, 2022
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares Under Option, Beginning balance | shares 7.5
Shares Under Option, Granted | shares 2.3
Shares Under Option, Exercised | shares (0.7)
Shares Under Option, Ending balance | shares 9.1
Shares Under Option, Exercisable at end of year | shares 2.5
Shares Under Option, Ending unvested and expected to vest | shares 5.9
Weighted Average Exercise Price, Beginning balance | $ / shares $ 81.30
Weighted Average Exercise Price, Granted | $ / shares 157.69
Weighted Average Exercise Price, Exercised | $ / shares 52.87
Weighted Average Exercise Price, Ending balance | $ / shares 103.17
Weighted Average Exercise Price, Exercisable at end of year | $ / shares 59.16
Weighted Average Exercise Price, Ending unvested and expected to vest | $ / shares $ 118.18
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 8 months 8 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 1 month 28 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 5 years 7 months 6 days
Aggregate Intrinsic Value, Ending Balance | $ $ 650.2
Aggregate Intrinsic Value, Exercisable at end of year | $ 291.2
Aggregate Intrinsic Value, Ending unvested and expected to vest | $ $ 331.7