Business Acquisitions - Pro Forma (Details) - Trans Union de Mexico, S.A., S.I.C. - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Business Combination [Line Items]
Pro-forma revenue	$ 1,309.6	$ 1,181.6	$ 2,588.5	$ 2,315.0
Pro-forma net income attributable to TransUnion	$ 142.8	$ 110.3	$ 303.3	$ 493.7

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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