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Commitment and Contingent Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]          
2020 (remaining three months) $ 0.9   $ 0.9    
2021 3.7   3.7    
2022 3.1   3.1    
2023 0.4   0.4    
2024 0.4   0.4    
Aggregate minimum rental commitments 8.5   8.5    
Rental expense 0.9 $ 0.8 2.8 $ 2.0  
Office leases, payment guarantees          
Loss Contingencies [Line Items]          
Guarantees $ 0.6   $ 0.6   $ 0.6