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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Debt |  |  |  |
Effective interest rate including effects of interest rate swap agreements | 5.50% | 5.20% | 5.50% | 5.20%
Amortization of deferred debt issuance costs | $ 1.2 | $ 1.2 | $ 2.4 | $ 2.4

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