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GOODWILL AND INTANGIBLE ASSETS, NET GOODWILL AND INTANGIBLE ASSETS, NET - INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Definite-lived intangible assets:      
Gross Carrying Amount $ 84.3   $ 83.3
Accumulated Amortization (70.8)   (69.5)
Net Carrying Amount 13.5   13.8
Aggregate Amortization Expense 0.5 $ 0.5  
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]      
2018 2.0    
2019 1.7    
2020 1.7    
2021 1.6    
2022 $ 1.4    
Technology      
Definite-lived intangible assets:      
Weighted Average Life (in years) 7 years    
Gross Carrying Amount $ 19.3   18.8
Accumulated Amortization (18.3)   (17.8)
Net Carrying Amount $ 1.0   1.0
Customer Relationships      
Definite-lived intangible assets:      
Weighted Average Life (in years) 20 years    
Gross Carrying Amount $ 33.5   33.2
Accumulated Amortization (28.9)   (28.3)
Net Carrying Amount $ 4.6   4.9
Land Use Rights      
Definite-lived intangible assets:      
Weighted Average Life (in years) 81 years    
Gross Carrying Amount $ 4.8   4.8
Accumulated Amortization (0.6)   (0.6)
Net Carrying Amount $ 4.2   4.2
Other      
Definite-lived intangible assets:      
Weighted Average Life (in years) 8 years    
Gross Carrying Amount $ 26.7   26.5
Accumulated Amortization (23.0)   (22.8)
Net Carrying Amount $ 3.7   $ 3.7