Supplemental Financial Data - Property, Plant and Equipment - Net (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment - net	$ 96.9	$ 96.8
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7.7	7.7
Building and building improvement
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	63.3	61.8
Less: accumulated depreciation	2.4	0.7
Property, plant and equipment - net	60.9	61.1
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	48.1	38.2
Less: accumulated depreciation	27.0	19.5
Property, plant and equipment - net	21.1	18.7
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16.2	16.6
Less: accumulated depreciation	9.0	7.3
Property, plant and equipment - net	$ 7.2	$ 9.3