Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segments:
Total revenue	$ 2,666.5	$ 2,735.7	$ 5,187.5	$ 5,304.2
Net revenue	2,328.5	2,375.5	4,505.4	4,602.7
Segment EBITA	331.9	370.2	541.1	637.2
Amortization of acquired intangibles	(21.2)	(21.1)	(42.1)	(42.4)
Depreciation	45.3	46.0	90.9	92.5
Capital expenditures	46.4	41.6	79.3	72.3
Total assets	17,110.0		17,110.0		$ 18,845.0
Operating income	310.7	349.1	499.0	594.8
Total (expenses) and other income	(32.1)	(34.3)	(54.4)	(70.1)
Income before income taxes	278.6	314.8	444.6	524.7
Restructuring charges	(1.7)	(0.1)	(0.1)	6.5
Lease impairment costs	(2.4)	0.0	(1.2)	5.3
MD&E
Segments:
Total revenue	1,070.2	1,089.0	2,052.0	2,085.8
Net revenue	1,055.5	1,065.3	2,016.3	2,039.0
Segment EBITA	143.3	168.9	222.4	280.7
Amortization of acquired intangibles	19.4	17.8	38.8	35.7
Depreciation	26.9	25.8	53.2	52.2
Capital expenditures	30.8	21.6	53.2	37.6
Total assets	9,388.1		9,388.1		9,984.3
Restructuring charges	(1.2)	0.0	(1.2)	(0.1)
Lease impairment costs	(1.2)		(1.3)	(0.1)
IA&C
Segments:
Total revenue	1,010.6	1,055.8	1,974.7	2,068.4
Net revenue	913.7	961.8	1,789.3	1,878.7
Segment EBITA	132.3	162.9	231.1	282.9
Amortization of acquired intangibles	1.2	2.3	2.1	4.7
Depreciation	13.3	14.4	27.4	28.9
Capital expenditures	7.1	10.9	8.9	16.9
Total assets	4,982.7		4,982.7		5,083.5
Restructuring charges	0.0	(0.1)	0.3	6.1
Lease impairment costs	(0.2)		(0.2)	5.2
SC&E
Segments:
Total revenue	585.7	590.9	1,160.8	1,150.0
Net revenue	359.3	348.4	699.8	685.0
Segment EBITA	71.3	59.4	116.5	115.5
Amortization of acquired intangibles	0.6	1.0	1.2	2.0
Depreciation	3.9	4.2	8.1	8.3
Capital expenditures	1.5	2.5	2.0	3.3
Total assets	1,656.9		1,656.9		1,629.9
Restructuring charges	(0.4)	0.0	0.9	0.4
Lease impairment costs	(1.0)		0.3	0.2
Corporate and Other
Segments:
Segment EBITA	(15.0)	(21.0)	(28.9)	(41.9)
Amortization of acquired intangibles	0.0	0.0	0.0	0.0
Depreciation	1.2	1.6	2.2	3.1
Capital expenditures	7.0	6.6	15.2	14.5
Total assets	1,082.3		1,082.3		$ 2,147.3
Restructuring charges	$ (0.1)	$ 0.0	$ (0.1)	$ 0.1