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Property and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 140.7   $ 125.7
Less: accumulated depreciation (66.1)   (60.6)
Property and equipment, net 74.6   65.1
Depreciation expense 5.2 $ 4.8  
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 15.1   17.1
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3.7   3.7
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 20.4   13.1
Internal use developed software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 90.5   84.0
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 11.0   $ 7.8