Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 15,878.8
Reclassified out of AOCI	(20.2)	$ 23.1
Net other comprehensive (loss) income	(106.3)	80.2
Ending balance	16,871.9	13,882.0
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(11.0)	35.1
Recorded into AOCI	28.8	(46.4)
Reclassified out of AOCI	(20.4)	23.2
Net other comprehensive (loss) income	8.4	(23.2)
Ending balance	(2.6)	11.9
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13.9)	(43.6)
Recorded into AOCI	(1.0)	11.3
Reclassified out of AOCI	(0.9)	(0.8)
Net other comprehensive (loss) income	(1.9)	10.5
Ending balance	(15.8)	(33.1)
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(110.3)	(110.9)
Recorded into AOCI	4.6	0.2
Reclassified out of AOCI	1.1	0.7
Net other comprehensive (loss) income	5.7	0.9
Ending balance	(104.6)	(110.0)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(558.7)	(834.0)
Recorded into AOCI	(118.5)	92.0
Net other comprehensive (loss) income	(118.5)	92.0
Ending balance	(677.2)	(742.0)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(693.9)	(953.4)
Recorded into AOCI	(86.1)	57.1
Reclassified out of AOCI	(20.2)	23.1
Net other comprehensive (loss) income	(106.3)	80.2
Ending balance	$ (800.2)	$ (873.2)