Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 13,167.1
Reclassified out of AOCI	$ (26.9)	$ (32.9)	38.4	$ (30.2)
Net other comprehensive (loss) income	(159.8)	(281.4)	15.8	(472.0)
Ending balance	16,023.1	12,893.5	16,023.1	12,893.5
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13.5)	12.7	35.1	(13.5)
Recorded into AOCI	57.5	56.2	(55.8)	90.7
Reclassified out of AOCI	(27.7)	(38.2)	37.0	(46.5)
Net other comprehensive (loss) income	29.8	18.0	(18.8)	44.2
Ending balance	16.3	30.7	16.3	30.7
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(40.8)	(34.5)	(43.6)	(1.1)
Recorded into AOCI	2.2	(16.9)	6.7	(50.0)
Reclassified out of AOCI	(0.4)	(0.3)	(2.1)	(0.6)
Net other comprehensive (loss) income	1.8	(17.2)	4.6	(50.6)
Ending balance	(39.0)	(51.7)	(39.0)	(51.7)
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(108.0)	(247.1)	(110.9)	(269.8)
Recorded into AOCI	(0.5)	9.5	0.1	20.9
Reclassified out of AOCI	1.2	5.6	3.5	16.9
Net other comprehensive (loss) income	0.7	15.1	3.6	37.8
Ending balance	(107.3)	(232.0)	(107.3)	(232.0)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(615.5)	(842.8)	(834.0)	(636.7)
Recorded into AOCI	(192.1)	(297.3)	26.4	(503.4)
Net other comprehensive (loss) income	(192.1)	(297.3)	26.4	(503.4)
Ending balance	(807.6)	(1,140.1)	(807.6)	(1,140.1)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(777.8)	(1,111.7)	(953.4)	(921.1)
Recorded into AOCI	(132.9)	(248.5)	(22.6)	(441.8)
Reclassified out of AOCI	(26.9)	(32.9)	38.4	(30.2)
Net other comprehensive (loss) income	(159.8)	(281.4)	15.8	(472.0)
Ending balance	$ (937.6)	$ (1,393.1)	$ (937.6)	$ (1,393.1)