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Borrowings - SBI Bonds (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
JPY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
JPY (¥)
Jul. 25, 2016
USD ($)
Jul. 25, 2016
JPY (¥)
Debt Instrument [Line Items]              
Outstanding principal amount $ 1,750,125,000     $ 1,751,816,000      
SBI bonds              
Debt Instrument [Line Items]              
Outstanding principal amount 23,125,000     24,816,000      
VFH | SBI bonds | SBI Bonds              
Debt Instrument [Line Items]              
Face amount           $ 33,100,000 ¥ 3,500,000,000
Outstanding principal amount 23,100,000   ¥ 3,500,000,000 $ 24,800,000 ¥ 3,500,000,000    
Gain (loss) on due to change in currency rates $ 1,700,000 $ 300,000