Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Narrative (Details)

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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
 3 Months Ended 4 Months Ended 12 Months Ended 16 Months Ended
Dec. 31, 2018
USD ($)
lawsuit
office
claim
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
lawsuit
office
plaintiff
claim
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
lawsuit
office
claim
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, loss in period $ 46,100,000            
Loss contingency, pending individual arbitration claims, number | claim 50   50     50  
Rental expense for operating leases     $ 41,300,000 $ 34,500,000 $ 29,100,000    
Cash paid for data processing, outsourcing services and other agreements     $ 49,000,000 40,000,000 $ 45,000,000    
Qualifying termination period, continuation of benefits for executives     3 years        
Qualifying termination period, continuation of benefits for executives, automatic renewal     3 years        
Change in control event, voting stock acquired (or more)     20.00%        
Conditional payment for unrecognized severance benefit for key executives     $ 40,700,000        
Assumed tax on expected payment for unrecognized severance benefit for key executives $ 900,000   $ 900,000     $ 900,000  
Conditional payout percentage of target award     100.00%        
Maximum potential future payments required to make under guarantees 0   $ 0     0  
Change in control event, minimum common stock received     66.67%        
Accrual related to indemnifications 0 $ 0 $ 0 0   0  
Letter of Credit              
Commitments and Contingencies Disclosure [Line Items]              
Notional amount 0   $ 0     0  
Minimum              
Commitments and Contingencies Disclosure [Line Items]              
Benefit continuation period     2 years        
Maximum              
Commitments and Contingencies Disclosure [Line Items]              
Benefit continuation period     3 years        
Performance Bonds              
Commitments and Contingencies Disclosure [Line Items]              
Notional amount 0   $ 0     0  
Data Processing, Outsourcing Services And Other Agreements | Minimum              
Commitments and Contingencies Disclosure [Line Items]              
Data processing, outsourcing services and other agreements, expiration year     2019        
Data processing, outsourcing services and other agreements, estimated aggregate contractual obligation 134,000,000   $ 134,000,000     134,000,000  
Non cancelable contractual obligations within any annual period 102,000,000   $ 102,000,000     102,000,000  
Data Processing, Outsourcing Services And Other Agreements | Maximum              
Commitments and Contingencies Disclosure [Line Items]              
Data processing, outsourcing services and other agreements, expiration year     2024        
IBM Operations Support Services Agreement              
Commitments and Contingencies Disclosure [Line Items]              
Expected future year's minimum contractual obligation 30,000,000   $ 30,000,000     30,000,000  
Expected future year's minimum contractual obligation within any annual period $ 26,000,000   $ 26,000,000     $ 26,000,000  
U.S.              
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, number of plaintiffs | plaintiff     2,500        
Canada              
Commitments and Contingencies Disclosure [Line Items]              
Pending claims, number | claim 7   7     7  
Pending national claims, number | claim 5   5     5  
Cybersecurity Incident              
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, loss in period   164,000,000 $ 20,400,000        
(Expenses incurred) insurance receivable recorded     75,000,000 50,000,000      
Proceeds from insurance settlement   15,000,000 $ 110,000,000        
Number of state Attorneys General offices in cooperation with | office 48   48     48  
Insurance settlements receivable $ 0 35,000,000 $ 0 35,000,000   $ 0  
Cybersecurity Incident | GEORGIA              
Commitments and Contingencies Disclosure [Line Items]              
Number of putative class actions | lawsuit 4   4     4  
Cybersecurity Incident, Multi-State Investigation              
Commitments and Contingencies Disclosure [Line Items]              
Number of state Attorneys General offices in cooperation with | office 46   46     46  
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services              
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, loss in period   $ 113,300,000 $ 326,200,000 114,000,000      
(Expenses incurred) insurance receivable recorded           $ 125,000,000  
Insurance coverage deductible     7,500,000.0        
Cybersecurity Incident, Free Credit File Monitoring And Identity Theft Protection Offering              
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, loss in period       $ 50,700,000      
Cybersecurity Incident, Free Credit File Monitoring And Identity Theft Protection Offering | Selling, general and administrative expenses              
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, loss in period     $ 20,400,000        
Public Records Litigation              
Commitments and Contingencies Disclosure [Line Items]              
Loss contingency, estimate of possible loss             $ 18,500,000
Individual Consumer Actions              
Commitments and Contingencies Disclosure [Line Items]              
Pending claims, number | claim 1,000   1,000     1,000  
Civil Judgments and Tax Liens              
Commitments and Contingencies Disclosure [Line Items]              
Number of putative class actions | lawsuit 19   19     19