Segment Operations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) numberOfPeople	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segments:
Number of Reportable Segments | numberOfPeople	3
EBITA	$ 1,566.6	$ 1,465.9	$ 1,522.4
Total (expenses) and other income	(74.6)	(112.3)	(214.1)
Total revenue	10,889.3	10,927.8	10,240.7
Net revenue	9,400.6	9,449.4	9,107.9
Operating Income (Loss)	1,482.6	1,381.2	1,436.2
Amortization of Intangible Assets	84.0	84.7	86.2
Interest expense	(225.6)	(167.9)	(170.6)
Interest income	140.8	56.6	27.2
Other income (expense), net	10.2	(1.0)	(70.7)
Income before income taxes	1,408.0	1,268.9	1,222.1
Depreciation and amortization	180.3	189.3	197.6
Capital expenditures	179.3	178.1	195.3
Assets	19,267.3	18,811.7
Restructuring Charges	0.1	102.4	10.6
Corporate and Other
Segments:
EBITA	(72.3)	(94.5)	(129.4)
Amortization of Intangible Assets	0.0	0.0	0.0
Depreciation and amortization	5.0	6.6	9.2
Capital expenditures	32.0	29.6	30.0
Assets	1,938.8	2,114.0
Restructuring Charges	0.1	0.8	(2.1)
MD&E
Segments:
EBITA	832.4	744.5	865.3
Total revenue	4,394.8	4,381.6	4,196.6
Net revenue	4,326.5	4,296.9	4,117.7
Amortization of Intangible Assets	77.3	72.8	71.9
Depreciation and amortization	105.8	107.4	108.0
Capital expenditures	100.1	97.4	99.7
Assets	10,715.4	9,984.3
Restructuring Charges	(1.3)	69.1	0.1
IA&C
Segments:
EBITA	541.3	581.4	597.9
Total revenue	4,002.2	4,140.6	4,041.8
Net revenue	3,633.2	3,766.3	3,679.7
Amortization of Intangible Assets	4.3	7.2	10.4
Depreciation and amortization	53.6	58.4	62.7
Capital expenditures	40.8	43.8	57.5
Assets	4,812.5	5,083.5
Restructuring Charges	0.2	28.7	2.6
SC&E
Segments:
EBITA	265.2	234.5	188.6
Total revenue	2,492.3	2,405.6	2,002.3
Net revenue	1,440.9	1,386.2	1,310.5
Amortization of Intangible Assets	2.4	4.7	3.9
Depreciation and amortization	15.9	16.9	17.7
Capital expenditures	6.4	7.3	8.1
Assets	1,800.6	1,629.9
Restructuring Charges	$ 1.1	$ 3.8	$ 10.0