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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
4 Months Ended 8 Months Ended 10 Months Ended 12 Months Ended
Apr. 30, 2012
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2011
Loan fees included in other interest and expense          
Total loan fees     $ 1.9 $ 3.8  
Senior Loans [Member]
         
Loan fees included in other interest and expense          
Loss on early extinguishment of debt     0 0  
Total loan fees     0 2.4  
Senior Secured Revolving Line Of Credit [Member]
         
Loan fees included in other interest and expense          
Total loan fees     0.7 1.1  
9.625% notes
         
Loan fees included in other interest and expense          
Total loan fees 0 0 1.0 0 0
Other debt [Member]
         
Loan fees included in other interest and expense          
Total loan fees     0.2 0.3  
TransUnion Corp-Successor | Transunion Corp [Member]
         
Loan fees included in other interest and expense          
Loss on early extinguishment of debt   0   0  
Total loan fees   0.9   3.8  
TransUnion Corp-Successor | Transunion Corp [Member] | Senior Loans [Member]
         
Loan fees included in other interest and expense          
Loss on early extinguishment of debt   0   0  
Total loan fees   0   2.4  
TransUnion Corp-Successor | Transunion Corp [Member] | Senior Secured Revolving Line Of Credit [Member]
         
Loan fees included in other interest and expense          
Total loan fees   0.7   1.1  
TransUnion Corp-Successor | Transunion Corp [Member] | Other debt [Member]
         
Loan fees included in other interest and expense          
Total loan fees   0.2   0.3  
TransUnion Corp-Predecessor | Transunion Corp [Member]
         
Loan fees included in other interest and expense          
Loss on early extinguishment of debt 0       59.3
Total loan fees 3.1       60.9
TransUnion Corp-Predecessor | Transunion Corp [Member] | Senior Loans [Member]
         
Loan fees included in other interest and expense          
Loss on early extinguishment of debt 0       59.3
Total loan fees 0       0
TransUnion Corp-Predecessor | Transunion Corp [Member] | Senior Secured Revolving Line Of Credit [Member]
         
Loan fees included in other interest and expense          
Total loan fees 0.4       1.3
TransUnion Corp-Predecessor | Transunion Corp [Member] | Other debt [Member]
         
Loan fees included in other interest and expense          
Total loan fees $ 2.7       $ 0.3