Components of Comprehensive Income, Net of Related Tax (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 972.1	$ 1,228.5	$ 3,290.0	$ 3,183.5
Other comprehensive (loss) income (OCI):
Unrealized (losses) gains on derivative contracts	(9.7)	38.6	27.9	(23.9)
Tax effect	3.4	(8.8)	(6.4)	5.1
Net current period OCI, unrealized (losses) gains on derivative contracts	(6.3)	29.8	21.5	(18.8)
Unrealized gains on marketable debt securities	35.7	2.5	35.8	6.2
Tax effect	(8.9)	(0.7)	(8.9)	(1.6)
Net current period OCI, unrealized gains (losses) on marketable debt securities	26.8	1.8	26.9	4.6
Pension plans	2.0	1.4	12.3	4.7
Tax effect	0.2	(0.7)	(2.4)	(1.1)
Net current period OCI, pension plans	2.2	0.7	9.9	3.6
Foreign currency translation gains (losses)	117.1	(192.1)	(169.8)	26.4
Net other comprehensive (loss) income	139.8	(159.8)	(111.5)	15.8
Comprehensive income	$ 1,111.9	$ 1,068.7	$ 3,178.5	$ 3,199.3