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Investments - Gains and Losses on Investments within Change in Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Net gain on equity securities (level 1) | $ 0.0 | $ 86.4 | $ 0.0 | $ 290.4
Net loss on equity securities (other) | (5.0) | 0.0 | 0.0 | 0.0
Equity method (loss) gain on Other investments | 0.0 | (0.7) | 0.9 | (1.1)
Change in fair value of investments | (5.0) | 85.7 | 0.9 | 289.3
Total net realized gain on equity securities | 0.0 | 36.9 | 0.0 | 89.8
Total net unrealized (loss) gain on equity securities | $ (5.0) | $ 49.5 | $ 0.0 | $ 200.6

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