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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, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
Net gain on equity securities (level 1) | $ 0.0 | $ 0.0 | $ 281.0
Net loss on equity securities (other) | (3.0) | (1.0) | (1.0)
Equity method gain (loss) on Other investments | 0.0 | 1.0 | (1.0)
Change in fair value of investments | (3.0) | 0.0 | 279.0
Total net realized gain on equity securities | 0.0 | 0.0 | 281.0
Total net unrealized loss on equity securities | $ (3.0) | $ (1.0) | $ (1.0)

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