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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost of investments | $ 21,468.5 |  | $ 21,468.5 |  | $ 19,810.0
Total investments at fair value | 21,338.5 |  | 21,338.5 |  | 20,009.5
Purchases of investments |  |  | 7,048.0 | $ 8,026.0 |
Proceeds from investment commitments repaid |  |  | 5,565.0 | 6,738.0 |
Ivy Hill Asset Management, L.P. |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost of investments | 1,809.0 |  | 1,809.0 |  | 781.0
Total investments at fair value | 1,958.0 |  | 1,958.0 |  | 936.0
Realized loss on sale of investments |  |  | 10,000.0 | 5.0 |
Purchases of investments |  |  | 27.0 |  |
Proceeds from investment commitments repaid |  |  | 233.0 | 108.0 |
Equity investment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost of investments | 1,373.0 |  | 1,373.0 |  | 765.0
Total investments at fair value | 1,522.0 |  | 1,522.0 |  | 920.0
Debt investment |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost of investments | 436.0 |  | 436.0 |  | 16.0
Total investments at fair value | 436.0 |  | 436.0 |  | 16.0
Ivy Hill Asset Management, L.P. |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Assets under management | 12,500.0 |  | 12,500.0 |  |
Amortized cost of investments | 2,133.0 |  | 2,133.0 |  | $ 966.0
Management and incentive fee income | 13.0 | $ 8.0 | 34.0 | 23.0 |
Other investment-related income | $ 42.0 | $ 22.0 | 103.0 | 64.0 |
Purchases of investments |  |  | $ 2,415,000.0 | $ 1,049.0 |

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