Components of Comprehensive Income, Net of Related Tax (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 769.4	$ 380.5	$ 2,090.3	$ 1,346.8
Other comprehensive income (loss) (OCI):
Unrealized gains on derivative contracts	24.3	8.2	61.4	29.4
Tax effect	(6.3)	(1.6)	(17.2)	(7.6)
Net current period OCI, unrealized gains (losses) on derivative contracts	18.0	6.6	44.2	21.8
Unrealized losses on marketable debt securities	(22.7)	(3.4)	(67.2)	(12.2)
Tax effect	5.5	0.7	16.6	2.9
Net current period OCI, unrealized gains and (losses) on marketable debt securities	(17.2)	(2.7)	(50.6)	(9.3)
Pension plans	20.2	22.7	50.4	49.0
Tax effect	(5.1)	(5.4)	(12.6)	(11.6)
Net current period OCI, pension plans	15.1	17.3	37.8	37.4
Foreign currency translation losses	(297.3)	(136.8)	(503.4)	(144.8)
Net other comprehensive loss	(281.4)	(115.6)	(472.0)	(94.9)
Comprehensive income	$ 488.0	$ 264.9	$ 1,618.3	$ 1,251.9