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Debt - Details of each borrowing under the Repurchase Agreement - Subnote (Details) - Term Loan
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument    
Fixed rate 5.25% 5.25%
Maturity Date Mar. 14, 2025 Mar. 14, 2025
LIBOR    
Debt Instrument    
Debt Instrument, Basis Spread on Variable Rate 4.25% 4.25%
LIBOR | Floating rate    
Debt Instrument    
Debt Instrument, Basis Spread on Variable Rate 0.08% 0.14%
LIBOR | Floor rate    
Debt Instrument    
Debt Instrument, Basis Spread on Variable Rate 1.00% 1.00%