PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment.
Gross property, plant and equipment	$ 764.9	$ 724.2
Less: Accumulated depreciation	(358.3)	(334.8)
Net property, plant and equipment	406.6	389.4
Depreciation	42.3	39.6	$ 39.0
Property
Property, plant and equipment.
Gross property, plant and equipment	43.6	40.9
Plant
Property, plant and equipment.
Gross property, plant and equipment	250.1	168.1
Equipment
Property, plant and equipment.
Gross property, plant and equipment	390.2	358.3
Leasehold improvements
Property, plant and equipment.
Gross property, plant and equipment	49.9	55.8
Construction in progress
Property, plant and equipment.
Gross property, plant and equipment	$ 31.1	$ 101.1

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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