Components of Comprehensive Income, Net of Related Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 733.9	$ 600.5
Other comprehensive income (loss) (OCI):
Unrealized (losses) gains on derivative contracts	(29.5)	36.1
Tax effect	6.3	(9.7)
Net current period OCI, unrealized (losses) gains on derivative contracts	(23.2)	26.4
Unrealized gains (losses) on marketable debt securities	14.0	(34.1)
Tax effect	(3.5)	8.5
Net current period OCI, unrealized gains (losses) on marketable debt securities	10.5	(25.6)
Pension plans	1.0	10.3
Tax effect	(0.1)	(2.4)
Net current period OCI, pension plans	0.9	7.9
Foreign currency translation gains	92.0	34.7
Net other comprehensive income	80.2	43.4
Comprehensive income	$ 814.1	$ 643.9