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INVESTMENTS - Ivy Hill Asset Management, L.P. (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
borrower
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
borrower
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]          
Amortized cost of investments $ 21,864.0   $ 21,864.0   $ 22,043.0
Purchases of investments     3,852.0 $ 7,048.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Amortized cost of investments 1,825.0   1,825.0   2,048.0
Purchases of investments     26.0 27.0  
Realized loss on sale of investments     12.0 10.0  
Ivy Hill Asset Management, L.P.          
Schedule of Investments [Line Items]          
Assets under management $ 13,900.0   $ 13,900.0    
Number of borrowers | borrower 23   23    
Amortized cost of investments $ 2,314.0   $ 2,314.0   $ 2,370.0
Management and incentive fee income 15.0 $ 14.0 42.0 35.0  
Other investment-related income $ 80.0 $ 51.0 236.0 130.0  
Purchases of investments     $ 842.0 $ 2,415.0