COMMITMENTS AND CONTINGENCIES - Schedule of Private Equity Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Total net adjusted unfunded loan commitments	$ 24.0	$ 32.0
Equity investment commitments
Other Commitments [Line Items]
Total equity commitments	179.3	168.9
Less: funded commitments	(75.9)	(64.3)
Total net adjusted unfunded loan commitments	103.4	104.6
Less: equity commitments substantially at discretion of the Company	(43.0)	(43.0)
Total net unfunded revolving and delayed draw loan commitments	$ 60.4	$ 61.6