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Cover Page - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
Jan. 31, 2024
Jun. 30, 2023
Cover [Abstract]      
Document type 10-K    
Current fiscal year end date --12-31    
Document Quarterly Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-37470    
Entity registrant name TransUnion    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 61-1678417    
Entity Address, Address Line One 555 West Adams,    
Entity Address, City or Town Chicago,    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60661    
City Area Code 312    
Local Phone Number 985-2000    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol TRU    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity filer category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] true    
Entity Shell Company false    
Entity Public Float     $ 15,100.0
Entity Common Stock, Shares Outstanding   194.0  
Documents Incorporated by Reference Portions of the Proxy Statement of TransUnion for the Annual Meeting of Stockholders to be held May 2, 2024 are incorporated by reference to the extent specified in Part III of this Form 10-K.    
Amendment flag false    
Document Fiscal Year Focus 2023    
Document fiscal period focus FY    
Entity central index key 0001552033