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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt |  |  |  |
Effective interest rate including effects of interest rate swap agreements |  |  | 3.4% | 4.7%
Amortization of deferred debt issuance costs | $ 1.2 | $ 4.6 | $ 3.7 | $ 9.0

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