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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Property, plant and equipment.    
Gross property, plant and equipment $ 725.5 $ 724.2
Less: Accumulated depreciation (336.7) (334.8)
Net property, plant and equipment 388.8 389.4
Property    
Property, plant and equipment.    
Gross property, plant and equipment 40.2 40.9
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 164.9 168.1
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment 358.1 358.3
Leasehold Improvements    
Property, plant and equipment.    
Gross property, plant and equipment 56.7 55.8
Construction in Progress    
Property, plant and equipment.    
Gross property, plant and equipment $ 105.6 $ 101.1