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GOODWILL AND INTANGIBLE ASSETS, NET - INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets - Gross Carrying Amount $ 66.1 $ 64.4  
Definite-lived intangible assets - Accumulated Amortization (57.8) (54.7)  
Definite-lived intangible assets - Net Carrying Amount 8.3 9.7  
Aggregate Amortization Expense 1.8 1.8 $ 1.8
Estimated Aggregate Intangible Asset Amortization Expense      
2021 1.7    
2022 1.3    
2023 0.7    
2024 0.5    
2025 $ 0.4    
Technology      
Finite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets - Weighted Average Life (in years) 7 years    
Definite-lived intangible assets - Gross Carrying Amount $ 10.1 9.4  
Definite-lived intangible assets - Accumulated Amortization (9.6) (8.8)  
Definite-lived intangible assets - Net Carrying Amount $ 0.5 0.6  
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets - Weighted Average Life (in years) 22 years    
Definite-lived intangible assets - Gross Carrying Amount $ 26.1 25.6  
Definite-lived intangible assets - Accumulated Amortization (24.1) (22.8)  
Definite-lived intangible assets - Net Carrying Amount $ 2.0 2.8  
Land Use Rights      
Finite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets - Weighted Average Life (in years) 80 years    
Definite-lived intangible assets - Gross Carrying Amount $ 4.4 4.3  
Definite-lived intangible assets - Accumulated Amortization (0.7) (0.7)  
Definite-lived intangible assets - Net Carrying Amount $ 3.7 3.6  
Other      
Finite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets - Weighted Average Life (in years) 8 years    
Definite-lived intangible assets - Gross Carrying Amount $ 25.5 25.1  
Definite-lived intangible assets - Accumulated Amortization (23.4) (22.4)  
Definite-lived intangible assets - Net Carrying Amount $ 2.1 $ 2.7