XML 137 R64.htm IDEA: XBRL DOCUMENT v3.20.4
Property and Equipment - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Depreciation expense related to property and equipment $ 28.0 $ 23.6 $ 18.4