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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Assets:    
Realized (Losses) Gains during Period   $ (0.6)
Additions   7.0
Balance at End of Period $ 6.4 6.4
Level 3    
Assets:    
Realized (Losses) Gains during Period (0.6)  
Additions 7.0  
Balance at End of Period 6.4 6.4
Note receivable - building sale    
Assets:    
Realized (Losses) Gains during Period   (0.6)
Additions   7.0
Balance at End of Period 6.4 6.4
Note receivable - building sale | Level 3    
Assets:    
Realized (Losses) Gains during Period (0.6)  
Additions 7.0  
Balance at End of Period $ 6.4 $ 6.4