Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 10,390.0	$ 9,706.1
Reclassified out of AOCI	19.6	106.3	$ 56.3
Net other comprehensive income (loss)	129.2	49.8	(1.6)
Ending balance	11,437.4	10,390.0	9,706.1
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(29.2)	(15.3)	2.0
Recorded into AOCI	39.9	(78.4)	(57.0)
Reclassified out of AOCI	(24.2)	64.5	39.7
Net other comprehensive income (loss)	15.7	(13.9)	(17.3)
Ending balance	(13.5)	(29.2)	(15.3)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	14.6	6.1	(2.3)
Recorded into AOCI	(14.1)	10.3	8.7
Reclassified out of AOCI	(1.6)	(1.8)	(0.3)
Net other comprehensive income (loss)	(15.7)	8.5	8.4
Ending balance	(1.1)	14.6	6.1
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(578.1)	(517.7)	(477.8)
Recorded into AOCI	262.9	(104.0)	(56.8)
Reclassified out of AOCI	45.4	43.6	16.9
Net other comprehensive income (loss)	308.3	(60.4)	(39.9)
Ending balance	(269.8)	(578.1)	(517.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(457.6)	(573.2)	(620.4)
Recorded into AOCI	(179.1)	115.6	47.2
Net other comprehensive income (loss)	(179.1)	115.6	47.2
Ending balance	(636.7)	(457.6)	(573.2)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,050.3)	(1,100.1)	(1,098.5)
Recorded into AOCI	109.6	(56.5)	(57.9)
Reclassified out of AOCI	19.6	106.3	56.3
Net other comprehensive income (loss)	129.2	49.8	(1.6)
Ending balance	$ (921.1)	$ (1,050.3)	$ (1,100.1)