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Property and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 87.7   $ 87.7   $ 71.4
Less: accumulated depreciation (37.5)   (37.5)   (29.7)
Property and equipment, net 50.2   50.2   41.7 [1]
Impairment charges     0.0 $ 2.7  
Depreciation expense 4.8 $ 2.9 12.9 $ 10.4  
Waltham office relocation          
Property, Plant and Equipment [Line Items]          
Impairment charges         2.7
Computer equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 12.7   12.7   12.5
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3.7   3.7   3.6
Furniture and fixtures | Waltham office relocation          
Property, Plant and Equipment [Line Items]          
Accelerated depreciation         2.1
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9.6   9.6   8.6
Leasehold improvements | Waltham office relocation          
Property, Plant and Equipment [Line Items]          
Impairment charges         1.2
Internal use developed software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 58.7   58.7   40.8
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 3.0   $ 3.0   5.9
Operating lease, right-of-use asset | Waltham office relocation          
Property, Plant and Equipment [Line Items]          
Impairment charges         $ 1.5
[1] The Condensed Consolidated Balance Sheet as of December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.