Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segments:
Total revenue	$ 2,678.5	$ 2,637.7	$ 7,866.0	$ 7,941.9
Net revenue	2,309.0	2,296.2	6,814.4	6,898.9
Segment EBITA	397.8	362.0	938.9	999.2
Amortization of acquired intangibles	(21.0)	(20.2)	(63.1)	(62.6)
Depreciation	45.0	46.8	135.9	139.3
Capital expenditures	47.8	46.2	127.1	118.5
Total assets	17,027.3		17,027.3		$ 18,845.0
Operating income	376.8	341.8	875.8	936.6
Total (expenses) and other income	(37.3)	(10.4)	(91.7)	(80.5)
Income before income taxes	339.5	331.4	784.1	856.1
Restructuring charges	(0.6)	(5.8)	(0.7)	0.7
Lease impairment costs	(0.7)	(7.3)	(1.9)	(2.0)
MD&E
Segments:
Total revenue	1,069.3	1,040.7	3,121.3	3,126.5
Net revenue	1,054.4	1,024.2	3,070.7	3,063.2
Segment EBITA	208.0	170.3	430.4	451.0
Amortization of acquired intangibles	19.2	17.7	58.0	53.4
Depreciation	26.6	26.3	79.8	78.5
Capital expenditures	21.8	27.2	75.0	64.8
Total assets	9,271.7		9,271.7		9,984.3
Restructuring charges	(0.1)	0.0	(1.3)	(0.1)
Lease impairment costs	(0.1)		(1.3)	(0.1)
IA&C
Segments:
Total revenue	966.4	1,011.4	2,941.1	3,079.8
Net revenue	883.3	927.1	2,672.6	2,805.8
Segment EBITA	130.4	147.9	361.5	430.8
Amortization of acquired intangibles	1.2	1.7	3.3	6.4
Depreciation	13.2	14.7	40.6	43.6
Capital expenditures	14.7	9.6	23.6	26.5
Total assets	4,760.7		4,760.7		5,083.5
Restructuring charges	(0.5)	0.0	(0.2)	6.1
Lease impairment costs	(0.6)		(0.8)	5.2
SC&E
Segments:
Total revenue	642.8	585.6	1,803.6	1,735.6
Net revenue	371.3	344.9	1,071.1	1,029.9
Segment EBITA	77.7	63.8	194.2	179.3
Amortization of acquired intangibles	0.6	0.8	1.8	2.8
Depreciation	4.0	4.3	12.1	12.6
Capital expenditures	1.8	2.4	3.8	5.7
Total assets	1,802.5		1,802.5		1,629.9
Restructuring charges	(0.2)	(5.8)	0.7	(5.4)
Lease impairment costs	(0.2)	(7.3)		(7.1)
Corporate and Other
Segments:
Segment EBITA	(18.3)	(20.0)	(47.2)	(61.9)
Amortization of acquired intangibles	0.0	0.0	0.0	0.0
Depreciation	1.2	1.5	3.4	4.6
Capital expenditures	9.5	7.0	24.7	21.5
Total assets	1,192.4		1,192.4		$ 2,147.3
Restructuring charges	$ 0.2	$ 0.0	$ 0.1	$ 0.1