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Contingencies (Details) - Ramirez v. Trans Union LLC [Member]
6 Months Ended
Jun. 30, 2017
USD ($)
plantiff
Loss Contingencies [Line Items]  
Loss Contingency, Number of Plaintiffs | plantiff 8,185
Punitive Damages [Member] | Minimum [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Estimate of Possible Loss $ 0
Punitive Damages [Member] | Maximum [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Estimate of Possible Loss 8,100,000
Judicial Ruling [Member] | Statutory Damages [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Awarded, Value 8,100,000
Judicial Ruling [Member] | Statutory Damages [Member] | Per person [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Awarded, Value 984.22
Judicial Ruling [Member] | Punitive Damages [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Awarded, Value 52,000,000
Judicial Ruling [Member] | Punitive Damages [Member] | Per person [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Awarded, Value $ 6,353.08