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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property And Equipment [Abstract]      
Depreciation and amortization expense $ 63.8 $ 51.4 $ 41.3
Disposals of long-lived assets $ 0.9 $ 0.3 $ 0.4