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Long-Term Debt - Scheduled Maturities of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Debt Disclosure [Abstract] |  |
2025 | $ 0.0 |
2026 | 0.0 |
2027 | 62.8 |
2028 | 0.0 |
2029 | 738.0 |
2030 and thereafter | 0.0 |
Total long-term debt | 800.8 |
Less: Current maturities | 0.0 | $ 0.0
Less: Original issue discount | 4.3 |
Less: Financing costs | 5.8 |
Total long-term debt, net | $ 790.7 | $ 802.5

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