Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 17,506.9
Reclassified out of AOCI	54.5	$ (20.2)
Net other comprehensive income (loss)	150.2	(106.3)
Ending balance	18,022.1	16,871.9
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	32.5	(11.0)
Recorded into AOCI	(69.2)	28.8
Reclassified out of AOCI	53.8	(20.4)
Net other comprehensive income (loss)	(15.4)	8.4
Ending balance	17.1	(2.6)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(0.7)	(13.9)
Recorded into AOCI	11.4	(1.0)
Reclassified out of AOCI	(0.1)	(0.9)
Net other comprehensive income (loss)	11.3	(1.9)
Ending balance	10.6	(15.8)
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	69.7	(110.3)
Recorded into AOCI	(0.4)	4.6
Reclassified out of AOCI	0.8	1.1
Net other comprehensive income (loss)	0.4	5.7
Ending balance	70.1	(104.6)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,214.8)	(558.7)
Recorded into AOCI	153.9	(118.5)
Net other comprehensive income (loss)	153.9	(118.5)
Ending balance	(1,060.9)	(677.2)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,113.3)	(693.9)
Recorded into AOCI	95.7	(86.1)
Reclassified out of AOCI	54.5	(20.2)
Net other comprehensive income (loss)	150.2	(106.3)
Ending balance	$ (963.1)	$ (800.2)