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AVAILABLE-FOR-SALE SECURITIES - NARRATIVE (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, credit losses $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Allowance for credit losses, available-for-sale securities 0.0   0.0   $ 0.0
Proceeds from sale of available-for-sale securities 0.0 $ 0.0 0.0 $ 4.8  
Asset Pledged as Collateral          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities pledged as collateral $ 0.7   $ 0.7   $ 0.8