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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Property, plant and equipment.    
Gross property, plant and equipment $ 760.5 $ 724.2
Less: Accumulated depreciation (358.8) (334.8)
Net property, plant and equipment 401.7 389.4
Property    
Property, plant and equipment.    
Gross property, plant and equipment 42.2 40.9
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 244.6 168.1
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment 387.8 358.3
Leasehold Improvements    
Property, plant and equipment.    
Gross property, plant and equipment 57.3 55.8
Construction in Progress    
Property, plant and equipment.    
Gross property, plant and equipment $ 28.6 $ 101.1