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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Fixed income securities | $ 6.0 | $ 0.0
Equity securities (other) | 100.0 | 106.0
Other | 71.0 | 63.0
Total investments | 177.0 | 169.0
Less: Short-term Investments | (6.0) | 0.0
Long-term investments | $ 171.0 | $ 169.0

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