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Property and Equipment, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Property, Plant and Equipment [Line Items]          
Capital office leases - finance lease asset $ 7.2   $ 7.2   $ 30.5
Total property and equipment, gross 108.1   108.1   124.6
Accumulated depreciation (51.2)   (51.2)   (40.8)
Total property and equipment, net 56.9   56.9   83.8
Depreciation 8.6 $ 2.6 29.0 $ 9.2  
Impairment of Leasehold 0.0 $ 0.3 0.0 $ 5.5  
Finance Lease, Impairment Loss 13.8   13.8    
Computer hardware          
Property, Plant and Equipment [Line Items]          
Total computer hardware and other property 44.6   44.6   45.5
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Total computer hardware and other property 15.6   15.6   11.6
Furniture, fixtures and equipment          
Property, Plant and Equipment [Line Items]          
Total computer hardware and other property 38.8   38.8   34.7
Other          
Property, Plant and Equipment [Line Items]          
Total computer hardware and other property $ 1.9   $ 1.9   $ 2.3