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Long-Term Debt - Scheduled Maturities of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
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Debt Disclosure [Abstract] |  |
2021 | $ 2.6 |
2022 | 10.4 |
2023 | 10.4 |
2024 | 150.3 |
2025 and thereafter | 972.1 |
Total long-term debt | 1,145.8 |
Less: Current portion of long-term debt | 10.4 | $ 12.3
Less: Original issue discount | 1.7 |
Less: Financing costs | 11.9 |
Total long-term debt, net | $ 1,121.8 | $ 1,127.5

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