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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease cost      
Operating lease cost $ 6.6 $ 5.4 $ 5.5
Variable lease cost 1.7 1.7 1.7
Lease expense 8.4 7.1 7.2
Operating cash flows from operating leases 6.6 $ 6.9 $ 7.2
Amount of reimbursement for leasehold improvements $ 6.1