Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 11,594.0
Reclassified out of AOCI	$ (9.9)	$ 27.1	2.7	$ 29.7
Net other comprehensive (loss) income	(234.0)	86.8	(190.6)	20.7
Ending balance	12,518.0	11,330.3	12,518.0	11,330.3
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	12.9	(11.0)	(13.5)	(29.2)
Recorded into AOCI	16.4	(18.6)	34.5	7.5
Reclassified out of AOCI	(16.6)	15.6	(8.3)	7.7
Net other comprehensive (loss) income	(0.2)	(3.0)	26.2	15.2
Ending balance	12.7	(14.0)	12.7	(14.0)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(26.7)	9.6	(1.1)	14.6
Recorded into AOCI	(7.6)	(1.2)	(33.1)	(5.7)
Reclassified out of AOCI	(0.2)	(0.4)	(0.3)	(0.9)
Net other comprehensive (loss) income	(7.8)	(1.6)	(33.4)	(6.6)
Ending balance	(34.5)	8.0	(34.5)	8.0
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(261.9)	(568.3)	(269.8)	(578.1)
Recorded into AOCI	7.9	(1.6)	11.4	(2.8)
Reclassified out of AOCI	6.9	11.9	11.3	22.9
Net other comprehensive (loss) income	14.8	10.3	22.7	20.1
Ending balance	(247.1)	(558.0)	(247.1)	(558.0)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(602.0)	(546.7)	(636.7)	(457.6)
Recorded into AOCI	(240.8)	81.1	(206.1)	(8.0)
Net other comprehensive (loss) income	(240.8)	81.1	(206.1)	(8.0)
Ending balance	(842.8)	(465.6)	(842.8)	(465.6)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(877.7)	(1,116.4)	(921.1)	(1,050.3)
Recorded into AOCI	(224.1)	59.7	(193.3)	(9.0)
Reclassified out of AOCI	(9.9)	27.1	2.7	29.7
Net other comprehensive (loss) income	(234.0)	86.8	(190.6)	20.7
Ending balance	$ (1,111.7)	$ (1,029.6)	$ (1,111.7)	$ (1,029.6)