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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurements of Cash and Cash Equivalents, Restricted Cash, Investments, Derivatives, and Unfunded Revolving and Delayed Draw Loan Commitments (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Cash and cash equivalents | $ 411.0 | $ 303.0
Restricted cash | 42.0 | 34.0
Total investments | 21,496.5 | 21,779.8
Derivatives | (2.0) | (21.0)
Unfunded revolving and delayed draw loan commitments | (41.0) | (57.0)
Total |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Total investments | 21,491.0 | 21,775.0
Level 1 |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Cash and cash equivalents | 411.0 | 303.0
Restricted cash | 42.0 | 34.0
Total investments | 73.0 | 54.0
Derivatives | 0.0 | 0.0
Unfunded revolving and delayed draw loan commitments | 0.0 | 0.0
Level 2 |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Restricted cash | 0.0 | 0.0
Total investments | 661.0 | 360.0
Derivatives | (2.0) | (21.0)
Unfunded revolving and delayed draw loan commitments | 0.0 | 0.0
Level 3 |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Restricted cash | 0.0 | 0.0
Total investments | 20,757.0 | 21,361.0
Derivatives | 0.0 | 0.0
Unfunded revolving and delayed draw loan commitments | (41.0) | (57.0)
Investments measured at net asset value |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Total investments | $ 5.0 | $ 5.0

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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