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EXIT AND DISPOSAL ACTIVITIES (Additional Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]        
Impairment losses $ 0.0 $ 0.0 $ 11.5  
Assets reclassified from long lived assets held for sale   $ 6.7    
Period within which the reclassified assets will be rented out   5 years    
Depreciation and amortization expenses   $ 0.2    
Wafer Manufacturing operations | Discontinued Operations        
Restructuring Cost and Reserve [Line Items]        
Impairment losses     7.3  
Chongqing business subsidiary | Discontinued Operations, Held-for-sale        
Restructuring Cost and Reserve [Line Items]        
Property, plant and equipment, held for sale     57.8  
Prepaid land use rights, held for sale     1.7  
Machine and equipment        
Restructuring Cost and Reserve [Line Items]        
Assets reclassified from long lived assets held for sale   43.1    
Wafer plant        
Restructuring Cost and Reserve [Line Items]        
Assets reclassified from long lived assets held for sale   $ 5.1    
polysilicon assets [Member]        
Restructuring Cost and Reserve [Line Items]        
Impairment of Long-Lived Assets Held-for-use     $ 11.5  
Reported Value Measurement [Member] | Significant Production Assets [Member]        
Restructuring Cost and Reserve [Line Items]        
Property, Plant, and Equipment, Fair Value Disclosure       $ 144.7