| Document and Entity Information | Dec. 01, 2021 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001552033 |
| Document Type | 8-K/A |
| Document Period End Date | Dec. 1, 2021 |
| Entity Registrant Name | TransUnion |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-37470 |
| Entity Tax Identification Number | 61-1678417 |
| Entity Address, Address Line One | 555 West Adams Street |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | TRU |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Description | On December 1, 2021, Trans Union LLC (the “Company”), a subsidiary of TransUnion, completed its previously announced acquisition of the Marketing, Risk, and Communications Solutions Business (a business of Neustar, Inc.) (“Neustar”), pursuant to a Securities Purchase Agreement, dated as of September 11, 2021 with Aerial Investors LLC, a Delaware limited liability company (“Seller”), providing for the purchase from Seller all of the issued and outstanding shares of Aerial Ultimate Holdings Corp., a Delaware corporation (“Neustar Holdings”) (the “Acquisition”). On December 1, 2021, TransUnion filed its Current Report on Form 8-K (the “Original 8-K”) to report the completion of the Acquisition on December 1, 2021. Under Item 9.01 of the Original 8-K, TransUnion stated that (a) the financial statements of the business acquired required by Item 9.01 would be filed by amendment to the Original 8-K no later than 71 calendar days after the date on which the Original 8-K was required to be filed, and (b) the pro forma financial information required by Item 9.01 would be filed by amendment to the Original 8-K no later than 71 calendar days after the date on which the Original 8-K was required to be filed. Accordingly, this Current Report on Form 8-K/A amends Item 9.01 of the Original 8-K to present certain financial statements and certain pro forma financial information. Except for this Explanatory Note, the filing of the financial statements and the pro forma financial information required by Item 9.01, and the consent of PricewaterhouseCoopers LLP filed herewith as Exhibit 23.1, there are no changes to the Original 8-K. |
