Organization and Basis of Presentations (Details) $ / shares in Units, a in Thousands, ft² in Millions, $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Feb. 29, 2020 USD ($)	Sep. 30, 2021 USD ($) a ft² property $ / shares shares	Dec. 31, 2020 $ / shares
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Common shares of beneficial interest, par (in usd per share) | $ / shares		$ 0.01	$ 0.01
Number of joint ventures with real estate properties		9
Area of real estate property (in sq feet) | a		1,409
Aggregate portfolio, percent leased		92.60%
Sale of stock, maximum potential consideration | $	$ 100.0
Sale of stock, number of shares issued in transaction | shares		3,041,120
Working capital and general corporate purposes | $		$ 39.5
Proceeds from issuance or sale of equity | $		$ 60.5
RPT Realty, L.P.
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Ownership interest in RPT Realty, L. P.		97.90%	97.70%
Shopping Centers
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of real estate properties owned and managed		57
Area of real estate property (in sq feet) | ft²		14.0
Aggregate portfolio, percent leased		92.50%
Joint Venture, Net Lease Retail Assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of real estate properties owned and managed		30
Single-Tenant, Net Lease Retail Assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of real estate properties owned and managed		30