Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 11,594.0
Reclassified out of AOCI	12.6	$ 2.6
Net other comprehensive income (loss)	43.4	(66.1)
Ending balance	12,143.3	10,861.7
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13.5)	(29.2)
Recorded into AOCI	18.1	26.1
Reclassified out of AOCI	8.3	(7.9)
Net other comprehensive income (loss)	26.4	18.2
Ending balance	12.9	(11.0)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1.1)	14.6
Recorded into AOCI	(25.5)	(4.5)
Reclassified out of AOCI	(0.1)	(0.5)
Net other comprehensive income (loss)	(25.6)	(5.0)
Ending balance	(26.7)	9.6
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(269.8)	(578.1)
Recorded into AOCI	3.5	(1.2)
Reclassified out of AOCI	4.4	11.0
Net other comprehensive income (loss)	7.9	9.8
Ending balance	(261.9)	(568.3)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(636.7)	(457.6)
Recorded into AOCI	34.7	(89.1)
Net other comprehensive income (loss)	34.7	(89.1)
Ending balance	(602.0)	(546.7)
ACCUMULATED OTHER COMPREHENSIVE LOSS:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(921.1)	(1,050.3)
Recorded into AOCI	30.8	(68.7)
Reclassified out of AOCI	12.6	2.6
Net other comprehensive income (loss)	43.4	(66.1)
Ending balance	$ (877.7)	$ (1,116.4)