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INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 21,685.6 $ 22,043.0
Fair Value 21,496.5 21,779.8
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 1,968.0 2,048.0
Fair Value 2,151.0 2,201.0
Subordinated loan    
Schedule of Investments [Line Items]    
Amortized Cost 267.0 500.0
Fair Value 267.0 500.0
Equity    
Schedule of Investments [Line Items]    
Amortized Cost 1,701.0 1,548.0
Fair Value $ 1,884.0 $ 1,701.0