Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($) tenant segment property shares	Dec. 31, 2020 USD ($) property
Accounting Policies [Line Items]
Outstanding units \| shares	64,493,397
Percentage of rent collected	99.00%
Number of real estate properties held-for-sale \| property	4	1
Cash in excess of FDIC insured amounts	$ 6.6	$ 7.0
Straight-line rent receivables	$ 32.4	29.8
Number of tenants for whom, collections no longer probable \| tenant	5
Number of Reportable Segments \| segment	1
Covid-19 [Member]
Accounting Policies [Line Items]
Deferred Rent Receivables, Net	$ 1.6
Unbilled Revenues [Member]
Accounting Policies [Line Items]
Accounts Receivable, Gross	$ 5.9	$ 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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