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COMMITMENTS AND CONTINGENCIES - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Jul. 22, 2019 USD ($) | Dec. 31, 2020 USD ($) claim plaintiff lawsuit | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Cash paid for data processing, outsourcing services and other agreements |  | $ 50,000,000 | $ 52,000,000 | $ 49,000,000
Change in control event, voting stock acquired (or more) |  | 20.00% |  |
Percent of common stock received upon merger |  | 66.67% |  |
Conditional payment for unrecognized severance benefit for key executives |  | $ 32,400,000 |  |
Relative total shareholder return, period |  | 3 years |  |
Conditional payout percentage of target award |  | 100.00% |  |
Accrual related to indemnifications |  | $ 0 | 0 |
Google Agreement |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Expected future year's minimum contractual obligation |  | 120,000,000 |  |
Expected future year's minimum contractual obligation within any annual period |  | 44,000,000 |  |
Cash paid for data processing, outsourcing services and other agreements |  | $ 29,000,000 | 14,000,000 | $ 7,000,000
Minimum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Benefit continuation period |  | 2 years |  |
Data Processing, Outsourcing Services And Other Agreements | Minimum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Data processing, outsourcing services and other agreements, expiration year |  | 2021 |  |
Data processing, outsourcing services and other agreements, estimated aggregate contractual obligation |  | $ 318,000,000 |  |
Non cancelable contractual obligations within any annual period |  | $ 133,000,000 |  |
Data Processing, Outsourcing Services And Other Agreements | Maximum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Data processing, outsourcing services and other agreements, expiration year |  | 2027 |  |
IBM Operations Support Services Agreement |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Expected future year's minimum contractual obligation |  | $ 61,000,000 |  |
Expected future year's minimum contractual obligation within any annual period |  | $ 37,000,000 |  |
Canada |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Pending claims, number | claim |  | 5 |  |
Pending national claims, number | claim |  | 4 |  |
Loss contingency, number of plaintiffs | plaintiff |  | 19,000 |  |
Cybersecurity Incident |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loss contingency, loss in period | $ 380,500,000 |  |  |
Additional contributions for unreimbursed costs and expenses |  | $ 125,000,000.0 |  |
Cybersecurity Incident | Maximum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Settlement administration costs | $ 80,500,000 |  |  |
Cybersecurity Incident | GEORGIA |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Pending claims, number | lawsuit |  | 4 |  |
Number of claims combined into a single claim | lawsuit |  | 3 |  |
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loss contingency, loss in period |  |  | $ 800,900,000 |

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