Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 13,167.1	$ 11,594.0
Reclassified out of AOCI	93.7	61.3	$ 19.6
Net other comprehensive income (loss)	259.5	(32.3)	129.2
Ending balance	15,878.8	13,167.1	11,594.0
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	35.1	(13.5)	(29.2)
Recorded into AOCI	(137.9)	8.6	39.9
Reclassified out of AOCI	91.8	40.0	(24.2)
Net other comprehensive income (loss)	(46.1)	48.6	15.7
Ending balance	(11.0)	35.1	(13.5)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(43.6)	(1.1)	14.6
Recorded into AOCI	32.4	(41.3)	(14.1)
Reclassified out of AOCI	(2.7)	(1.2)	(1.6)
Net other comprehensive income (loss)	29.7	(42.5)	(15.7)
Ending balance	(13.9)	(43.6)	(1.1)
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(110.9)	(269.8)	(578.1)
Recorded into AOCI	(4.0)	136.4	262.9
Reclassified out of AOCI	4.6	22.5	45.4
Net other comprehensive income (loss)	0.6	158.9	308.3
Ending balance	(110.3)	(110.9)	(269.8)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(834.0)	(636.7)	(457.6)
Recorded into AOCI	275.3	(197.3)	(179.1)
Net other comprehensive income (loss)	275.3	(197.3)	(179.1)
Ending balance	(558.7)	(834.0)	(636.7)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(953.4)	(921.1)	(1,050.3)
Recorded into AOCI	165.8	(93.6)	109.6
Reclassified out of AOCI	93.7	61.3	19.6
Net other comprehensive income (loss)	259.5	(32.3)	129.2
Ending balance	$ (693.9)	$ (953.4)	$ (921.1)