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Leases - Lease Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease cost $ 3.8 $ 4.1 $ 4.8
Operating cash flows from operating leases $ 3.8 $ 4.1 $ 4.8