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Property and Equipment, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Capital office leases - finance lease asset $ 8.0   $ 8.0
Total property and equipment, gross 113.7   110.3
Accumulated depreciation (61.4)   (55.8)
Total property and equipment, net 52.3   54.5
Depreciation 5.9 $ 10.6  
Computer hardware      
Property, Plant and Equipment [Line Items]      
Total computer hardware and other property 47.2   45.1
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total computer hardware and other property 16.2   16.1
Furniture, fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Total computer hardware and other property 40.2   39.0
Other      
Property, Plant and Equipment [Line Items]      
Total computer hardware and other property $ 2.1   $ 2.1