Intangible Assets - Summary (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross	$ 5,761.0	$ 5,551.9
Accumulated Amortization	(2,522.2)	(2,294.5)
Net	3,238.7	3,257.5
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	2,088.3	2,055.0
Accumulated Amortization	(627.4)	(561.7)
Net	1,460.9	1,493.3
Internal use software
Finite-Lived Intangible Assets [Line Items]
Gross	1,711.7	1,589.1
Accumulated Amortization	(735.6)	(653.0)
Net	976.0	936.2
Database and credit files
Finite-Lived Intangible Assets [Line Items]
Gross	1,389.9	1,339.8
Accumulated Amortization	(965.6)	(896.6)
Net	424.3	443.2
Trademarks, copyrights and patents
Finite-Lived Intangible Assets [Line Items]
Gross	567.0	566.7
Accumulated Amortization	(190.5)	(183.0)
Net	376.5	383.7
Noncompete and other agreements
Finite-Lived Intangible Assets [Line Items]
Gross	4.0	1.3
Accumulated Amortization	(3.1)	(0.2)
Net	$ 1.0	$ 1.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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