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Residential Loans and Residential Loans Held for Sale, at Fair Value - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Net realized gain on payoff of residential loans $ 5.4 $ 0.6 $ 5.4 $ 2.3  
Gain on sale of residential loans 7.1 $ 4.7 7.1 $ 1.5  
Residential loans | Foreclosure          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Process of foreclosure 73.7   73.7    
Principal outstanding 88.0   88.0    
Consolidated SLST | VIE, Primary Beneficiary | Residential loans | 90 Days or Greater Delinquent          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Principal outstanding 139.4   139.4   $ 117.1
Residential Loans Held in Consolidated SLST | VIE, Primary Beneficiary | Residential loans | Foreclosure          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Process of foreclosure $ 47.5   $ 47.5