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Property, Equipment and Software, net - Schedule of Property, Equipment and Software, net (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property, equipment and software, at cost $ 2,047.8 $ 2,034.0
Less: Accumulated depreciation (1,441.5) (1,442.1)
Property, equipment and software, net 616.3 608.8
Computers and equipment    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, at cost 1,170.8 1,154.9
Software    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, at cost 446.2 452.8
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, at cost 12.3 14.5
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, equipment and software, at cost 418.5 411.8
Work in process    
Property, Plant and Equipment [Line Items]    
Work in process $ 10.0 $ 16.9