Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Shares Under Option, Beginning balance	8.3	7.5
Shares Under Option, Granted	1.2	2.4
Shares Under Option, Exercised	(1.3)	(1.4)
Shares Under Option, Forfeited or canceled	(0.3)	(0.2)
Shares Under Option, Ending balance	7.9	8.3
Shares Under Option, Exercisable at end of year	1.8	1.8
Shares Under Option, Ending unvested and expected to vest	5.7	5.9
Weighted Average Exercise Price, Beginning balance	$ 107.47	$ 81.30
Weighted Average Exercise Price, Granted	177.78	157.74
Weighted Average Exercise Price, Exercised	62.33	53.53
Weighted Average Exercise Price, Forfeited or canceled	143.78	109.10
Weighted Average Exercise Price, Ending balance	123.85	107.47
Weighted Average Exercise Price, Exercisable at end of year	73.04	61.11
Weighted Average Exercise Price, Ending unvested and expected to vest	$ 137.02	$ 118.80
Weighted Average Remaining Contractual Term (in years), Ending balance	3 years 11 months 19 days	4 years 2 months 4 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year	1 year 7 months 17 days	1 year 6 months 21 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest	4 years 7 months 6 days	4 years 10 months 9 days
Aggregate Intrinsic Value, Ending Balance	$ 793.9	$ 668.9
Aggregate Intrinsic Value, Exercisable at end of year	266.4	230.8
Aggregate Intrinsic Value, Ending unvested and expected to vest	$ 497.2	$ 413.2