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Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]      
2021 $ 4.8    
2022 5.0    
2023 2.8    
2024 2.8    
2025 and thereafter 4.4    
Aggregate minimum rental commitments 19.8    
Rental expense 3.8 $ 3.0 $ 1.5
Office leases, payment guarantees      
Loss Contingencies [Line Items]      
Guarantees $ 0.6 $ 0.6 $ 0.5