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Commitment and Contingent Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]          
2021 (remaining six months) $ 2.6   $ 2.6    
2022 4.9   4.9    
2023 2.8   2.8    
2024 2.8   2.8    
2025 and thereafter 4.1   4.1    
Aggregate minimum rental commitments 17.2   17.2    
Rental expense 1.1 $ 1.0 2.1 $ 1.9  
Office leases, payment guarantees          
Guarantor Obligations [Line Items]          
Guarantees $ 0.3   $ 0.3   $ 0.6