Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 11,594.0
Reclassified out of AOCI	$ (32.9)	$ (17.7)	(30.2)	$ 12.0
Net other comprehensive loss	(281.4)	(115.6)	(472.0)	(94.9)
Ending balance	12,893.5	11,479.8	12,893.5	11,479.8
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	12.7	(14.0)	(13.5)	(29.2)
Recorded into AOCI	56.2	35.3	90.7	42.8
Reclassified out of AOCI	(38.2)	(28.7)	(46.5)	(21.0)
Net other comprehensive loss	18.0	6.6	44.2	21.8
Ending balance	30.7	(7.4)	30.7	(7.4)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(34.5)	8.0	(1.1)	14.6
Recorded into AOCI	(16.9)	(2.5)	(50.0)	(8.2)
Reclassified out of AOCI	(0.3)	(0.2)	(0.6)	(1.1)
Net other comprehensive loss	(17.2)	(2.7)	(50.6)	(9.3)
Ending balance	(51.7)	5.3	(51.7)	5.3
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(247.1)	(558.0)	(269.8)	(578.1)
Recorded into AOCI	9.5	6.1	20.9	3.3
Reclassified out of AOCI	5.6	11.2	16.9	34.1
Net other comprehensive loss	15.1	17.3	37.8	37.4
Ending balance	(232.0)	(540.7)	(232.0)	(540.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(842.8)	(465.6)	(636.7)	(457.6)
Recorded into AOCI	(297.3)	(136.8)	(503.4)	(144.8)
Net other comprehensive loss	(297.3)	(136.8)	(503.4)	(144.8)
Ending balance	(1,140.1)	(602.4)	(1,140.1)	(602.4)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,111.7)	(1,029.6)	(921.1)	(1,050.3)
Recorded into AOCI	(248.5)	(97.9)	(441.8)	(106.9)
Reclassified out of AOCI	(32.9)	(17.7)	(30.2)	12.0
Net other comprehensive loss	(281.4)	(115.6)	(472.0)	(94.9)
Ending balance	$ (1,393.1)	$ (1,145.2)	$ (1,393.1)	$ (1,145.2)