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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Lease cost    
Operating lease cost $ 1.9 $ 1.3
Variable lease cost 0.5 0.4
Operating cash flows from operating leases $ 1.9 $ 1.7