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GOODWILL AND INTANGIBLE ASSETS, NET GOODWILL AND INTANGIBLE ASSETS, NET - INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Definite-lived intangible assets:          
Gross Carrying Amount $ 82.2   $ 82.2   $ 83.3
Accumulated Amortization (69.6)   (69.6)   (69.5)
Net Carrying Amount 12.6   12.6   13.8
Aggregate Amortization Expense 0.5 $ 0.5 1.0 $ 1.0  
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]          
2018 2.0   2.0    
2019 1.7   1.7    
2020 1.7   1.7    
2021 1.6   1.6    
2022 1.4   $ 1.4    
Technology          
Definite-lived intangible assets:          
Weighted Average Life (in years)     7 years    
Gross Carrying Amount 18.4   $ 18.4   18.8
Accumulated Amortization (17.6)   (17.6)   (17.8)
Net Carrying Amount 0.8   $ 0.8   1.0
Customer Relationships          
Definite-lived intangible assets:          
Weighted Average Life (in years)     20 years    
Gross Carrying Amount 32.9   $ 32.9   33.2
Accumulated Amortization (28.5)   (28.5)   (28.3)
Net Carrying Amount 4.4   $ 4.4   4.9
Land Use Rights          
Definite-lived intangible assets:          
Weighted Average Life (in years)     81 years    
Gross Carrying Amount 4.5   $ 4.5   4.8
Accumulated Amortization (0.6)   (0.6)   (0.6)
Net Carrying Amount 3.9   $ 3.9   4.2
Other          
Definite-lived intangible assets:          
Weighted Average Life (in years)     8 years    
Gross Carrying Amount 26.4   $ 26.4   26.5
Accumulated Amortization (22.9)   (22.9)   (22.8)
Net Carrying Amount $ 3.5   $ 3.5   $ 3.7