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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details) £ in Millions, $ in Millions	Apr. 03, 2020 USD ($)	Apr. 03, 2020 GBP (£)	Mar. 31, 2026 USD ($)	Dec. 03, 2020
Life Sciences Portfolio
Offsetting Liabilities [Line Items]
Investment at fair value			$ 25.7
MalinJ1
Offsetting Liabilities [Line Items]
Ownership percentage				63.90%
MalinJ1 \| MalinJ1
Offsetting Liabilities [Line Items]
Equity method investment ownership			41.00%
Option Agreement \| Portfolio Companies
Offsetting Liabilities [Line Items]
Payments to acquire investments	$ 277.5	£ 223.9