Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	[1]	$ 9,706.1
Reclassified out of AOCI		(44.0)	$ 14.8
Net other comprehensive (loss) income		(283.8)	3.0
Ending balance		9,637.4	9,105.5
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(15.3)	2.0
Recorded into AOCI		98.6	(22.7)
Reclassified out of AOCI		(57.2)	11.1
Net other comprehensive (loss) income		41.4	(11.6)
Ending balance		26.1	(9.6)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		6.1	(2.3)
Recorded into AOCI		(1.3)	4.6
Reclassified out of AOCI		(0.3)
Net other comprehensive (loss) income		(1.6)	4.6
Ending balance		4.5	2.3
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(517.7)	(477.8)
Recorded into AOCI		10.0	(3.1)
Reclassified out of AOCI		13.5	3.7
Net other comprehensive (loss) income		23.5	0.6
Ending balance		(494.2)	(477.2)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(573.2)	(620.4)
Recorded into AOCI		(347.1)	9.4
Net other comprehensive (loss) income		(347.1)	9.4
Ending balance		(920.3)	(611.0)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(1,100.1)	(1,098.5)
Recorded into AOCI		(239.8)	(11.8)
Reclassified out of AOCI		(44.0)	14.8
Net other comprehensive (loss) income		(283.8)	3.0
Ending balance		$ (1,383.9)	$ (1,095.5)

[1] The December 31, 2019 consolidated balance sheet has been derived from audited financial statements.