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SUBSEQUENT EVENTS Subsequent Events (Details)
¥ in Millions, $ in Millions
1 Months Ended
Jan. 31, 2020
CNY (¥)
Jan. 31, 2020
USD ($)
Mar. 31, 2021
Feb. 25, 2020
MWh
T
Dec. 31, 2019
T
Dec. 31, 2018
Zhao County EfW (China)            
Subsequent Event [Line Items]            
Equity Method Investment, Weight         1,200  
Equity Method Investment, Ownership Percentage         26.00% 0.00%
Subsequent Events | Newhurst Energy Recovery Facility            
Subsequent Event [Line Items]            
Equity Method Investment, Weight       350,000    
Equity Method Investment, Energy Output | MWh       42    
Equity Method Investment, Waste Processing Capacity       70.00%    
Subsequent Events | Zhao County EfW (China)            
Subsequent Event [Line Items]            
Proceeds from loan ¥ 61 $ 9        
Stated interest rate (percent) 12.00% 12.00%        
Joint Venture with Green Investment Group Limited | Subsequent Events | Newhurst Energy Recovery Facility            
Subsequent Event [Line Items]            
Equity Method Investment, Ownership Percentage       50.00%    
Biffa plc | Subsequent Events | Newhurst Energy Recovery Facility            
Subsequent Event [Line Items]            
Equity Method Investment, Ownership Percentage       50.00%    
Forecast | Subsequent Events | Zhao County EfW (China)            
Subsequent Event [Line Items]            
Equity Method Investment, Ownership Percentage     49.00%