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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Lease cost      
Operating lease cost $ 7.4 $ 6.6 $ 5.4
Variable lease cost 2.0 1.7 1.7
Lease expense 9.4 8.4 7.1
Operating cash flows from operating leases $ 7.5 6.6 $ 6.9
Amount of reimbursement for leasehold improvements   $ 6.1