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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Debt |  |  |  |
Effective interest rate including effects of interest rate swap agreements |  |  | 4.7% | 4.6%
Amortization of deferred debt issuance costs | $ 2.4 | $ 2.5 | $ 7.3 | $ 15.1

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