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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Property, plant and equipment.    
Gross property, plant and equipment $ 699.4 $ 667.3
Less: Accumulated depreciation (364.8) (356.3)
Net property, plant and equipment 334.6 311.0
Property    
Property, plant and equipment.    
Gross property, plant and equipment 48.3 43.3
Plant    
Property, plant and equipment.    
Gross property, plant and equipment 180.5 144.7
Equipment    
Property, plant and equipment.    
Gross property, plant and equipment $ 470.6 $ 479.3