Segment Information - Schedule of Other Selected Segment Financial Information and Supplemental Geographic and Disaggregated Revenue Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Depreciation and amortization	$ 146.5	$ 141.3	$ 291.2	$ 285.3
Capital expenditures:	1.1	0.8	2.9	2.1
Additions to computer software and other intangibles:	38.3	53.0	83.2	109.4
Assets:	8,739.9		8,739.9			$ 8,755.7
Goodwill:	3,477.8	3,426.6	3,477.8	3,426.6	$ 3,445.0	3,409.8	$ 3,424.7	$ 3,445.8
Other intangibles:	3,372.5	3,709.6	3,372.5	3,709.6	$ 3,435.0	3,506.8	$ 3,805.2	$ 3,915.9
Other long-lived assets:	1,214.3		1,214.3			1,185.8
Total long-lived assets	8,064.6		8,064.6			8,102.4
Deferred income tax	6.5		6.5			2.9
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Depreciation and amortization	43.5	32.3	84.0	63.6
Capital expenditures:	1.0	0.8	2.7	2.1
Additions to computer software and other intangibles:	37.8	52.4	69.9	95.9
Other EBITDA - Corporate and Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Depreciation and amortization	103.0	109.0	207.2	221.7
Capital expenditures:	0.1	0.0	0.2	0.0
Additions to computer software and other intangibles:	0.5	0.6	13.3	13.5
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets:	7,104.0		7,104.0			7,315.9
Goodwill:	2,929.6		2,929.6			2,929.6
Other intangibles:	2,973.0		2,973.0			3,124.3
Other long-lived assets:	963.9		963.9			964.2
North America | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Depreciation and amortization	34.6	26.2	67.8	51.7
Capital expenditures:	0.2	0.3	0.6	0.7
Additions to computer software and other intangibles:	31.1	45.2	57.2	80.5
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets:	1,635.9		1,635.9			1,439.8
Goodwill:	548.2		548.2			480.2
Other intangibles:	399.5		399.5			382.5
Other long-lived assets:	250.4		250.4			$ 221.6
International | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Depreciation and amortization	8.9	6.1	16.2	11.9
Capital expenditures:	0.8	0.5	2.1	1.4
Additions to computer software and other intangibles:	$ 6.7	$ 7.2	$ 12.7	$ 15.4