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Derivative Financial Instruments and Fair Value Measurements - Schedule of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Derivative [Line Items] |  |
Other current assets | $ 9.5 | $ 9.2
Other non-current assets | 12.9 | 16.5
Other current liabilities | (0.9) | (0.9)
Other long-term liabilities | (2.7) | (3.6)
Credit facility investment | 5.4 | 21.9
Equity investment | 13.2 | 19.4
Total net assets at fair value | 37.4 | 62.5
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivative [Line Items] |  |
Other current assets | 0.0 | 0.0
Other non-current assets | 0.0 | 0.0
Other current liabilities | 0.0 | 0.0
Other long-term liabilities | 0.0 | 0.0
Credit facility investment | 0.0 | 0.0
Equity investment | 13.2 | 19.4
Total net assets at fair value | 13.2 | 19.4
Significant Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Other current assets | 9.5 | 9.2
Other non-current assets | 12.9 | 16.5
Other current liabilities | (0.9) | (0.9)
Other long-term liabilities | (2.7) | (3.6)
Credit facility investment | 0.0 | 0.0
Equity investment | 0.0 | 0.0
Total net assets at fair value | 18.8 | 21.2
Significant Unobservable Inputs (Level 3) |  |
Derivative [Line Items] |  |
Other current assets | 0.0 | 0.0
Other non-current assets | 0.0 | 0.0
Other current liabilities | 0.0 | 0.0
Other long-term liabilities | 0.0 | 0.0
Credit facility investment | 5.4 | 21.9
Equity investment | 0.0 | 0.0
Total net assets at fair value | $ 5.4 | $ 21.9

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