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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 22, 2019 USD ($) office | Sep. 30, 2021 | Dec. 31, 2019 USD ($) | Dec. 31, 2017 claim plaintiff | Dec. 13, 2019 claim
Maximum |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Debt instrument, term (or less) |  | 1 year |  |  |
Georgia |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Pending claims |  |  |  | 4 |
Number of claims combined into a single claim |  |  |  | 3 |
Canada |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Pending claims |  |  |  | 5 |
Pending national class actions |  |  |  | 4 |
Number of plaintiffs | plaintiff |  |  |  | 19,000 |
Number of claims appealed |  |  |  |  | 1
Cybersecurity Incident |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Loss related to settlement | $ | $ 380.5 |  |  |  |
Number of state attorneys general offices company is in cooperation with | office | 48 |  |  |  |
Litigation settlement, additional contributions for unreimbursed costs and expenses | $ | $ 125.0 |  |  |  |
Cybersecurity Incident | Maximum |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Litigation settlement expense | $ | $ 80.5 |  |  |  |
Other Current Liabilities | Cybersecurity Incident |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Loss related to settlement | $ |  |  | $ 800.9 |  |

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