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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Details) | Sep. 30, 2021 | Sep. 30, 2020
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Debt Instrument [Line Items] |  |
Weighted average rates | 1.89% | 2.46%
Minimum |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 1.06% | 1.10%
Maximum |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 3.64% | 4.75%

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