Components of Comprehensive Income, Net of Related Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,195.3	$ 733.9
Other comprehensive income (loss) (OCI):
Unrealized gains (losses) on derivative contracts	12.1	(29.5)
Tax effect	(3.7)	6.3
Net current period OCI, unrealized (losses) gains on derivative contracts	8.4	(23.2)
Unrealized (losses) gains on marketable debt securities	(2.5)	14.0
Tax effect	0.6	(3.5)
Net current period OCI, unrealized gains (losses) on marketable debt securities	(1.9)	10.5
Pension plans	7.9	1.0
Tax effect	(2.2)	(0.1)
Net current period OCI, pension plans	5.7	0.9
Foreign currency translation (losses) gains	(118.5)	92.0
Net other comprehensive (loss) income	(106.3)	80.2
Comprehensive income	$ 1,089.0	$ 814.1