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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Lease cost      
Operating lease cost $ 5.0 $ 7.4 $ 6.6
Variable lease cost 1.1 2.0 1.7
Lease expense 6.1 9.4 8.4
Operating cash flows from operating leases $ 5.8 $ 7.5 6.6
Amount of reimbursement for leasehold improvements     $ 6.1