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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, 2023
USD ($)
$ / shares
shares
Share-Based Payment Arrangement [Abstract]  
Shares Under Option, Beginning balance | shares 8.3
Shares Under Option, Granted | shares 1.1
Shares Under Option, Exercised | shares (0.6)
Shares Under Option, Ending balance | shares 8.8
Shares Under Option, Exercisable at end of period | shares 2.4
Shares Under Option, Ending unvested and expected to vest | shares 5.7
Weighted Average Exercise Price, Beginning balance | $ / shares $ 107.47
Weighted Average Exercise Price, Granted | $ / shares 177.09
Weighted Average Exercise Price, Exercised | $ / shares 55.30
Weighted Average Exercise Price, Ending balance | $ / shares 119.91
Weighted Average Exercise Price, Exercisable at end of year | $ / shares 71.70
Weighted Average Exercise Price, Ending unvested and expected to vest | $ / shares $ 136.94
Weighted Average Remaining Contractual Term (in years), Ending balance 4 years 6 months 10 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year 2 years 3 months 7 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest 5 years 4 months 2 days
Aggregate Intrinsic Value, Ending Balance | $ $ 625.4
Aggregate Intrinsic Value, Exercisable at end of year | $ 291.2
Aggregate Intrinsic Value, Ending unvested and expected to vest | $ $ 309.2