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Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]        
Equity securities, net unrealized gain (loss) $ 13.9 $ 2.5 $ 11.4 $ 7.6