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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) borrower | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |
Amortized cost of investments | $ 22,043.0 | $ 19,810.0 |
Purchases of investments | 9,852.0 | 13,644.0 | $ 6,759.0
Ivy Hill Asset Management, L.P. |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost of investments | 2,048.0 | 781.0 |
Purchases of investments | 27.0 |  |
Realized loss on sale of investments | 20.0 | 7.0 | 21.0
Ivy Hill Asset Management, L.P. |  |  |
Schedule of Investments [Line Items] |  |  |
Assets under management | $ 13,100.0 |  |
Number of borrowers | borrower | 21 |  |
Amortized cost of investments | $ 2,370.0 | 966.0 |
Management and incentive fee income | 48.0 | 31.0 | 28.0
Other investment-related income | 189.0 | 91.0 | 75.0
Purchases of investments | $ 3,358.0 | $ 2,407.0 | $ 940.0

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