PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 55.3	$ 58.9
Less accumulated depreciation and amortization	40.4	44.9
Property, plant and equipment, net	14.9	14.0
SARL Business Segment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		1.1
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	38.6	43.6
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15.9	$ 14.5