Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Shares Under Option, Beginning balance	7.5
Shares Under Option, Granted	2.4
Shares Under Option, Exercised	(0.9)
Shares Under Option, Forfeited or canceled	(0.1)
Shares Under Option, Ending balance	8.9
Shares Under Option, Exercisable at end of year	2.3
Shares Under Option, Ending unvested and expected to vest	5.9
Weighted Average Exercise Price, Beginning balance	$ 81.30
Weighted Average Exercise Price, Granted	157.74
Weighted Average Exercise Price, Exercised	54.18
Weighted Average Exercise Price, Forfeited or canceled	100.51
Weighted Average Exercise Price, Ending balance	104.31
Weighted Average Exercise Price, Exercisable at end of year	59.14
Weighted Average Exercise Price, Ending unvested and expected to vest	$ 118.65
Weighted Average Remaining Contractual Term (in years), Ending balance	4 years 6 months
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year	1 year 10 months 28 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest	5 years 4 months 9 days
Aggregate Intrinsic Value, Ending Balance	$ 521.7
Aggregate Intrinsic Value, Exercisable at end of year	243.2
Aggregate Intrinsic Value, Ending unvested and expected to vest	$ 261.9