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Commitment and Contingent Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]          
2020 (remaining six months) $ 1.8   $ 1.8    
2021 3.4   3.4    
2022 3.1   3.1    
2023 0.3   0.3    
2024 0.3   0.3    
Aggregate minimum rental commitments 8.9   8.9    
Rental expense 1.0 $ 0.7 1.9 $ 1.2  
Office leases, payment guarantees          
Loss Contingencies [Line Items]          
Guarantees $ 0.6   $ 0.6   $ 0.6