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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property, plant and equipment.    
Gross property, plant and equipment $ 648.9 $ 629.5
Less: Accumulated depreciation (321.3) (312.2)
Net property, plant and equipment 327.6 317.3
Property    
Property, plant and equipment.    
Gross property, plant and equipment 39.5 39.6
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 163.7 161.3
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment $ 445.7 $ 428.6