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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in valuation allowances and reserves      
Deferred Tax Assets, Valuation Allowance $ 59.2 $ 46.7  
Allowance for doubtful accounts [Member]      
Movement in valuation allowances and reserves      
Balance at Beginning of Year 4.2 2.4 $ 0.7
Charged to Costs and Expenses 4.3 3.2 3.2
Charged to Other Accounts 0.0 0.0 0.0
Deductions (2.3) (1.4) (1.5)
Balance at End of Year 6.2 4.2 2.4
Allowance for deferred tax assets [Member]      
Movement in valuation allowances and reserves      
Balance at Beginning of Year 46.7 42.1 25.9
Charged to Costs and Expenses 13.6 5.3 19.5
Charged to Other Accounts 0.0 0.0 0.0
Deductions (1.1) (0.7) (3.3)
Balance at End of Year 59.2 46.7 42.1
TransUnion Parent [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Proceeds from Dividends Received $ 0.0 $ 45.1 $ 90.3