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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Debt |  |
Effective interest rate including effects of interest rate swap agreements | 5.2% | 4.9%
Amortization of deferred debt issuance costs | $ 1.8 | $ 1.3

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- Definition Description of any adjustments made to the stated rate to determine the effective rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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