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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, plant and equipment.      
Gross property, plant and equipment $ 724.2 $ 629.5  
Less: Accumulated depreciation (334.8) (312.2)  
Net property, plant and equipment 389.4 317.3  
Depreciation 39.6 39.0 $ 47.0
Property      
Property, plant and equipment.      
Gross property, plant and equipment 40.9 39.6  
Plant      
Property, plant and equipment.      
Gross property, plant and equipment 168.1 161.3  
Equipment      
Property, plant and equipment.      
Gross property, plant and equipment 358.3 337.3  
Leasehold improvements      
Property, plant and equipment.      
Gross property, plant and equipment 55.8 49.1  
Construction in progress      
Property, plant and equipment.      
Gross property, plant and equipment $ 101.1 $ 42.2