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Investments - Gains and Losses on Investments within Change in Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |
Net gain (loss) on equity securities (level 1) | $ 0.0 | $ 281.7 | $ (136.4)
Net (loss) gain on equity securities (other) | (0.8) | (1.3) | 15.1
Equity method gain (loss) on Other investments | 0.9 | (1.1) | (15.6)
Change in fair value of investments | 0.1 | 279.3 | (136.9)
Total net realized gain on equity securities | 0.0 | 281.7 | 44.6
Total net unrealized loss on equity securities | $ (0.8) | $ (1.3) | $ (165.9)

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