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COMMITMENTS AND CONTINGENCIES (Details) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 22, 2019 USD ($) office | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 claim | Dec. 31, 2017 claim plaintiff
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Maximum potential future payments |  | $ 0 |  |  |
Maximum |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Debt instrument, term (or less) |  | 1 year |  |  |
Georgia |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Pending claims | claim |  |  |  |  | 4
Number of claims combined into a single claim | claim |  |  |  | 3 |
Canada |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Pending claims | claim |  |  |  |  | 5
Pending national class actions | claim |  |  |  |  | 4
Number of plaintiffs | plaintiff |  |  |  |  | 19,000
Cybersecurity Incident |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Loss related to settlement | $ 380,500,000 |  |  |  |
Number of state attorneys general offices company is in cooperation with | office | 48 |  |  |  |
Litigation settlement, additional contributions for unreimbursed costs and expenses | $ 125,000,000.0 |  |  |  |
Cybersecurity Incident | Maximum |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Litigation settlement expense | $ 80,500,000 |  |  |  |
Letter of Credit |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Outstanding guarantees |  | $ 0 |  |  |
Other Current Liabilities | Cybersecurity Incident |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Loss related to settlement |  |  | $ 800,900,000 |  |

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