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MARKETABLE EQUITY SECURITIES (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Marketable Securities        
Mark-to-market increase on sale       $ (6.8)
Increase (decrease) in fair value of equity securities $ (1.3) $ 6.0 $ 1.4  
Investment value $ 1.7 $ 3.1 $ 17.9  
TriStar        
Marketable Securities        
Stock that can be purchased by warrants (in shares) 19,640,000