Business Acquisitions - Pro Forma (Details) - Trans Union de Mexico, S.A., S.I.C. - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Business Combination [Line Items]
Pro-forma revenue	$ 1,312.5	$ 1,217.3	$ 3,900.9	$ 3,532.3
Pro-forma net income attributable to TransUnion	$ 156.2	$ 98.8	$ 459.5	$ 592.6

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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