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SUBSEQUENT EVENTS (Details)
$ in Millions, € in Billions
Jul. 31, 2020
EUR (€)
Jul. 01, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Events        
Borrowings outstanding | $     $ 868.6 $ 867.6
Subsequent Event | Facility        
Subsequent Events        
Debt instrument face amount   € 1.5    
Borrowings outstanding   € 0.0    
Borrowing capacity available € 1.5      
Subsequent Event | EuroCCP        
Subsequent Events        
Ownership interest percentage   80.00%