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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lease cost      
Operating lease costs $ 4.8 $ 5.0 $ 7.4
Variable lease costs 1.3 1.1 2.0
Lease expense 6.1 6.1 9.4
Cash flows from operating leases $ 6.8 $ 5.8 $ 7.5