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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Property, plant and equipment.    
Gross property, plant and equipment $ 761.9 $ 764.9
Less: Accumulated depreciation (365.1) (358.3)
Net property, plant and equipment 396.8 406.6
Property    
Property, plant and equipment.    
Gross property, plant and equipment 43.2 43.6
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 249.3 250.1
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment 389.4 390.2
Leasehold Improvements    
Property, plant and equipment.    
Gross property, plant and equipment 49.7 49.9
Construction in Progress    
Property, plant and equipment.    
Gross property, plant and equipment $ 30.3 $ 31.1