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Debt - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
May 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 15, 2015
USD ($)
Apr. 09, 2014
USD ($)
Apr. 30, 2012
Debt Instrument [Line Items]                      
Net Leverage Ratio Requirement 6.5     6.5              
Accumulated other comprehensive loss $ (184.8)     $ (184.8)       $ (191.8)      
Long-term Debt 2,401.1     2,401.1              
Repayments of Lines of Credit       145.0 $ 85.0            
Deferred Financing Fees $ 1.5     $ 1.5       1.7      
Credit Facility [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount             $ 150.0        
Nine Point Six Two Five Percent Fixed Interest Per Annum TransUnion Senior Unsecured [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate 9.625%     9.625%              
Eight Point One Two Five Percent Fixed Interest Per Annum TransUnion Senior Unsecured [Member]                      
Debt Instrument [Line Items]                      
Fixed interest rate 8.125%     8.125%              
Senior Loans [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Fair Value Disclosure $ 1,986.8     $ 1,986.8              
Debt Instrument, Maturity Date     Apr. 09, 2021                
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.50%     3.50%              
Debt Instrument, Unamortized Discount (Premium), Net $ 8.4     $ 8.4       7.3      
Deferred Financing Fees 4.9     4.9       3.8      
Senior Secured Term Loan A [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Fair Value Disclosure $ 385.7     $ 385.7              
Debt Instrument, Face Amount           $ 55.0     $ 350.0    
Debt Instrument, Maturity Date     Jun. 30, 2020                
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.71%     2.71%              
Debt Instrument, Unamortized Discount (Premium), Net $ 0.8     $ 0.8       0.7      
Deferred Financing Fees $ 0.3     $ 0.3       0.1      
Swap                      
Debt Instrument [Line Items]                      
Fixed rate of interest                     2.033%
Accumulated other comprehensive loss                   $ 1.0  
Derivative Liability               $ 2.7      
Gain on Derivative Instruments, Pretax   $ 0.2                  
Loss on Derivative Instruments, Pretax         $ 0.7            
Interest Rate Cap [Member]                      
Debt Instrument [Line Items]                      
Derivative, Cap Interest Rate 0.75%     0.75%              
Derivative, Notional Amount $ 1,526.4     $ 1,526.4              
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 7.1     21.9              
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ 0.3     $ 1.0              
Minimum [Member] | Interest Rate Cap [Member]                      
Debt Instrument [Line Items]                      
Fixed rate of interest 0.98%     0.98%              
Maximum [Member] | Interest Rate Cap [Member]                      
Debt Instrument [Line Items]                      
Fixed rate of interest 0.994%     0.994%