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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |
Equity securities, net unrealized gains (losses) | $ (5.6) | $ 13.9 | $ (8.2) | $ 11.4

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