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v3.19.3.a.u2

Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Weighted average rates | 3.09% | 3.08%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 2.12% | 2.12%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 5.50% | 5.50%

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