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Borrowings - SBI Bonds (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
JPY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
JPY (¥)
Jul. 25, 2016
USD ($)
Jul. 25, 2016
JPY (¥)
Debt Instrument [Line Items]                  
Outstanding principal amount $ 2,068,665,000   $ 2,068,665,000     $ 1,767,265,000      
SBI bonds                  
Debt Instrument [Line Items]                  
Outstanding principal amount 23,665,000   23,665,000     22,265,000      
VFH | SBI bonds | SBI Bonds                  
Debt Instrument [Line Items]                  
Face amount               $ 33,100,000 ¥ 3,500,000,000
Outstanding principal amount 23,700,000   23,700,000   ¥ 3,500,000,000 $ 22,300,000 ¥ 3,500,000,000    
Gain (loss) on due to change in currency rates $ 600,000 $ (2,600,000) $ (1,400,000) $ 400,000