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COMMITMENTS AND CONTINGENCIES - Schedule of Loan Commitments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Total unfunded commitments	$ 41.0	$ 57.0
Revolving and delayed draw loan commitments
Other Commitments [Line Items]
Total commitments	2,448.9	2,915.8
Less: funded commitments	(593.5)	(526.2)
Total unfunded commitments	1,855.4	2,389.6
Less: commitments substantially at discretion of the Company	0.0	0.0
Less: unavailable commitments due to borrowing base or other covenant restrictions	(14.4)	(13.0)
Total net adjusted unfunded revolving and delayed draw loan commitments	$ 1,841.0	$ 2,376.6

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-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-15

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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147480990/946-20-50-15

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