PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 59.4	$ 57.4
Less accumulated depreciation and amortization	39.4	36.4
Property, plant and equipment, net	20.0	21.0
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	0.8	0.8
Furniture and fixtures, office, computer and other equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43.0	42.4
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15.6	$ 14.2