Property, Equipment and Software, net - Schedule of Property, Equipment and Software, net (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, equipment and software, at cost	$ 2,210.0	$ 2,228.1
Less: Accumulated depreciation	(1,427.2)	(1,413.4)
Property, equipment and software, net	794.7	826.7
Computers and equipment
Property, Plant and Equipment [Line Items]
Property, equipment and software, at cost	1,196.1	1,206.5
Software
Property, Plant and Equipment [Line Items]
Property, equipment and software, at cost	462.2	465.6
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, equipment and software, at cost	21.0	21.9
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, equipment and software, at cost	509.5	512.9
Land
Property, Plant and Equipment [Line Items]
Property, equipment and software, at cost	21.2	21.2
Work in process
Property, Plant and Equipment [Line Items]
Work in process	$ 11.9	$ 12.0