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Business Acquistion Callcredit Acquisition (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 19, 2018
Assets        
Goodwill(1) $ 3,352.5 $ 3,293.6    
Callcredit [Member]        
Callcredit Acquisition [Abstract]        
Business Acquisition, Effective Date of Acquisition Jun. 19, 2018      
Business Acquisition, Percentage of Voting Interests Acquired       100.00%
Business Acquisition, Name of Acquired Entity Callcredit Information Group, Ltd. (“Callcredit”)      
Payments to Acquire Businesses, Gross $ 1,408.2      
Contingent consideration $ 0.0      
Business Acquisition, Description of Acquired Entity Callcredit, founded in 2000, is a United Kingdom-based information solutions company that, like TransUnion, provides data, analytics and technology solutions to help businesses and consumers make informed decisions.      
Assets        
Trade accounts receivable $ 20.8      
Property and equipment 3.2      
Goodwill(1) 757.1      
Identifiable intangible assets 720.1      
All other assets 55.0      
Assets of discontinued operations(2) 57.1      
Total assets acquired 1,613.3      
Liabilities and stockholders’ equity        
All other liabilities (185.5)      
Liabilities of discontinued operations(2) (19.6)      
Net assets of the acquired company 1,408.2      
Business Acquisition, Goodwill, Expected Tax Deductible Amount 0.0      
Identifiable Amortizable Intangible Assets [Abstract]        
Finite-lived Intangible Assets Acquired $ 720.1      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years 1 month 6 days      
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year $ 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Five 51.0      
finite-lived intangible assets, amortization expense, year six 51.0      
Finite-Lived Intangible Assets,Amortization Expense, Year Seven 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Eight 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Nine 51.0      
Finite-Lived Intangibles Assets, Amortization Expense, Year Ten 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Eleven 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Twelve 51.0      
Finite-Lived Intangible Assets, Amortization Expense, Year Thirteen 51.0      
Acquisition Costs [Abstract]        
Business Acquisition, Transaction Costs 20.4 $ 19.9    
Business Acquisition, Pro Forma Revenue 1,188.2      
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax $ 118.8      
Callcredit [Member] | Database and credit files        
Identifiable Amortizable Intangible Assets [Abstract]        
Finite-Lived Intangible Asset, Useful Life 15 years      
Finite-lived Intangible Assets Acquired $ 502.0      
Callcredit [Member] | Customer relationships        
Identifiable Amortizable Intangible Assets [Abstract]        
Finite-Lived Intangible Asset, Useful Life 15 years      
Finite-lived Intangible Assets Acquired $ 155.0      
Callcredit [Member] | Technology and software        
Identifiable Amortizable Intangible Assets [Abstract]        
Finite-Lived Intangible Asset, Useful Life 5 years      
Finite-lived Intangible Assets Acquired $ 62.4      
Callcredit [Member] | Trademarks        
Identifiable Amortizable Intangible Assets [Abstract]        
Finite-Lived Intangible Asset, Useful Life 2 years      
Finite-lived Intangible Assets Acquired $ 0.7      
Acquisition-related Costs [Member] | Callcredit [Member]        
Acquisition Costs [Abstract]        
Business Acquisition, Transaction Costs     $ 18.2  
Acquisition-related financing cost [Member] | Callcredit [Member]        
Acquisition Costs [Abstract]        
Business Acquisition, Transaction Costs     $ 9.4