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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 |

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