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Commitments and Contingencies - Lease costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lease cost      
Operating lease cost $ 5.4 $ 5.5  
Variable lease cost 1.7 1.7  
Lease expense 7.1 7.2  
Lease expense - 2018     $ 6.3
Operating cash flows from operating leases $ 6.9 $ 7.2  
Operating cash flows from operating lease rent payments - 2018     $ 6.3