Property and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Capital office leases - finance lease asset	$ 31.0		$ 30.5
Total property and equipment, gross	130.4		124.6
Accumulated depreciation	(50.4)		(40.8)
Property and equipment, net	80.0		83.8
Depreciation	10.6	$ 3.3
Impairment of Leasehold		$ 1.0
Computer hardware
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	47.1		45.5
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	14.4		11.6
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	35.6		34.7
Other
Property, Plant and Equipment [Line Items]
Total computer hardware and other property	$ 2.3		$ 2.3