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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) property tenant segment shares | Dec. 31, 2020 USD ($) property
Accounting Policies [Line Items] |  |
Outstanding units | shares | 70,127,367 |
Number of real estate properties held-for-sale | property | 3 | 3
Cash in excess of FDIC insured amounts | $ 101.6 | $ 7.0
Straight-line rent receivables | $ 37.9 | 29.8
Number of tenants for whom, collections no longer probable | tenant | 4 |
Number of Reportable Segments | segment | 1 |
Covid-19 [Member] |  |
Accounting Policies [Line Items] |  |
Deferred Rent Receivables, Net | $ 0.8 |
Unbilled Revenues [Member] |  |
Accounting Policies [Line Items] |  |
Accounts Receivable, Gross | $ 10.0 | $ 4.1
Building [Member] |  |
Accounting Policies [Line Items] |  |
Useful life | 40 years |
Building Improvements [Member] | Minimum [Member] |  |
Accounting Policies [Line Items] |  |
Useful life | 10 years |
Building Improvements [Member] | Maximum [Member] |  |
Accounting Policies [Line Items] |  |
Useful life | 20 years |
Agree Realty Corporation [Member] | General Partner [Member] |  |
Accounting Policies [Line Items] |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 99.50% | 99.40%
Agree Realty Corporation [Member] | Third party [Member] |  |
Accounting Policies [Line Items] |  |
Non controlling interest | 0.50% | 0.60%

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