SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) loan_obligation	Dec. 31, 2023 USD ($) loan_obligation	Dec. 31, 2022 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of CLOs consolidated | loan_obligation	27	28
Foreign currency transaction gains (losses) | $	$ 0.6	$ (9.1)	$ (13.5)
ARCC
Summary of Significant Accounting Policies [Line Items]
Management fees as a percentage of net investment income	20.00%
Hurdle rate per quarter	1.75%
Hurdle rate per annum	7.00%
Percentage of net investment income received from first dollar earned	20.00%
ASIF
Summary of Significant Accounting Policies [Line Items]
Management fees as a percentage of net investment income	12.50%
Hurdle rate per quarter	1.25%
Hurdle rate per annum	5.00%
Percentage of net investment income received from first dollar earned	12.50%
CADC
Summary of Significant Accounting Policies [Line Items]
Management fees as a percentage of net investment income	15.00%
Hurdle rate per quarter	1.50%
Hurdle rate per annum	6.00%
Percentage of net investment income received from first dollar earned	15.00%
AESIF
Summary of Significant Accounting Policies [Line Items]
Management fees as a percentage of net investment income	12.50%
Hurdle rate per quarter	1.25%
Hurdle rate per annum	5.00%
Percentage of net investment income received from first dollar earned	12.50%
ACI
Summary of Significant Accounting Policies [Line Items]
Management fees as a percentage of net investment income	12.50%
Hurdle rate per quarter	1.25%
Hurdle rate per annum	5.00%
Percentage of net investment income received from first dollar earned	12.50%
Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives, intangible assets	1 year
Minimum | Property Plant And Equipment Other Than Leasehold Improvements
Summary of Significant Accounting Policies [Line Items]
Estimated useful life, fixed assets	3 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives, intangible assets	13 years 6 months
Performance fee compensation, employment or service period	6 years
Maximum | Property Plant And Equipment Other Than Leasehold Improvements
Summary of Significant Accounting Policies [Line Items]
Estimated useful life, fixed assets	7 years
Maximum | Leasehold Improvements
Summary of Significant Accounting Policies [Line Items]
Estimated useful life, fixed assets	10 years