PROPERTY, PLANT AND EQUIPMENT - Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Right-of-Use assets	$ 75.6	$ 87.0
Property, plant and equipment and Right-of-Use assets, net	305.9	352.0
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	10.9	11.4
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	44.7	48.3
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	86.8	98.7
Office furniture, fixtures and capitalized software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	63.6	76.2
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	18.7	21.3
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 5.6	$ 9.1