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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property, plant and equipment.    
Gross property, plant and equipment $ 692.6 $ 667.3
Less: Accumulated depreciation (363.5) (356.3)
Net property, plant and equipment 329.1 311.0
Property    
Property, plant and equipment.    
Gross property, plant and equipment 48.2 43.3
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 177.1 144.7
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment $ 467.3 $ 479.3