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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Fixed income securities | $ 0.3 | $ 0.6
Equity securities (other) | 105.9 | 96.0
Other | 62.8 | 61.1
Total investments | 169.0 | 157.7
Less: Short-term investments | (0.3) | (0.6)
Long-term investments | $ 168.7 | $ 157.1

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