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ACQUISITION - Narrative (Details) - USD ($) shares in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 29, 2021 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration liability | $ 306,300,000 |  |  | $ 95,800,000 | $ 306,300,000
Level 3 | Fair value, measurements, recurring |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration liability | 306,300,000 |  |  | 95,800,000 | 306,300,000
OHA Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration |  | $ 2,487,400,000 | $ 8,500,000 |  |
Stock consideration (in shares) |  | 4.4 |  |  |
Stock consideration | 881,500,000 | $ 881,500,000 |  |  |
Debt assumed |  | $ 217,100,000 |  |  |
Consideration restriction from sale, period |  | 1 year |  |  |
Contingent consideration, maximum earnout payment |  | $ 900,000,000.0 |  |  |
Extended earnout payment period |  | 2 years |  |  |
Earnout payout, if 75% threshold not met |  | $ 0 |  |  |
Earnout 75% threshold |  | 75.00% |  |  |
Earnout 30% threshold |  | 22.00% |  |  |
Contingent consideration liability | $ 306,300,000 | $ 257,000,000.0 |  |  | 306,300,000
Acquisition-related retention liability |  |  |  | $ 900,000 | $ 31,900,000
Deductible portion of goodwill acquired |  | 1,200,000,000 |  |  |
Indefinite- and definite-lived investment management contracts |  | 778,700,000 |  |  |
OHA Acquisition | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Indefinite-lived intangible assets acquired, management contracts |  | $ 134,700,000 |  |  |

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