Supplemental Financial Data - Property, Plant and Equipment - Net (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ 45.7	$ 38.4
Property, plant and equipment - net	102.1	96.9
Right of use assets	15.9	4.6
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	63.7	63.3
Less: accumulated depreciation	4.0	2.4
Property, plant and equipment - net	59.7	60.9
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61.9	48.1
Less: accumulated depreciation	32.8	27.0
Property, plant and equipment - net	29.1	21.1
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14.5	16.2
Less: accumulated depreciation	8.9	9.0
Property, plant and equipment - net	$ 5.6	$ 7.2