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Commitment and Contingent Liabilities - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]          
Rental expense $ 1.3 $ 0.9 $ 3.4 $ 2.8  
Office leases, payment guarantees          
Guarantor Obligations [Line Items]          
Guarantees $ 0.2   $ 0.2   $ 0.6