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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Debt |  |  |
Effective interest rate including effects of interest rate swap agreements | 5.30% | 3.80% | 4.40%
Amortization of deferred debt issuance costs | $ 4.9 | $ 4.9 | $ 10.2

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