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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