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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Property, plant and equipment.    
Gross property, plant and equipment $ 686.8 $ 629.5
Less: Accumulated depreciation (327.4) (312.2)
Net property, plant and equipment 359.4 317.3
Property    
Property, plant and equipment.    
Gross property, plant and equipment 38.7 39.6
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 159.5 161.3
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment 344.5 337.3
Leasehold Improvements    
Property, plant and equipment.    
Gross property, plant and equipment 54.0 49.1
Construction in Progress    
Property, plant and equipment.    
Gross property, plant and equipment $ 90.1 $ 42.2