PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 52.1	$ 50.4
Less accumulated depreciation and amortization	35.6	33.8
Property, plant and equipment, net	16.5	16.6
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	37.8	36.5
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 13.5	$ 13.1