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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 29, 2021 | Dec. 31, 2020
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Business Acquisition [Line Items] |  |  |
Period end assets under management | $ 1,640,900.0 |  | $ 1,470,500.0
OHA Acquisition | Fee-basis assets |  |  |
Business Acquisition [Line Items] |  |  |
Period end assets under management |  | $ 46,900.0 |

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