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Participations Sold (Details) - Dec. 31, 2020 - Mezzanine Loans - Office Building - London
£ in Millions, $ in Millions
USD ($)
GBP (£)
Participating Mortgage Loans [Line Items]    
Debt instrument, face amount $ 8.9 £ 6.7
Remaining unfunded commitment $ 25.3 £ 19.1