PROPERTY, PLANT AND EQUIPMENT - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Right-of-Use assets	$ 87.0	$ 92.7
Property, plant and equipment and Right-of-Use assets, net	352.0	408.6
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	11.4	10.8
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	48.3	51.6
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	98.7	114.7
Office furniture, fixtures and capitalized software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	76.2	100.3
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	21.3	24.5
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 9.1	$ 14.0