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Noncontrolling Interests - Change in Carrying Value (Details) - USD ($) $ in Thousands				3 Months Ended
	Mar. 28, 2019	Apr. 30, 2018	Mar. 30, 2018	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Change in the carrying value of all noncontrolling interests
Carrying value at beginning of the period				$ 32,247
Allocation of net income				296	$ 316
Carrying value at end of the period				$ 32,141
Realty Income, L.P.
Change in the carrying value of all noncontrolling interests
Number of partnership units issued (in units)	89,322	131,790	242,007
Number of partnership units outstanding (in units)				463,119		463,119
Noncontrolling interests
Change in the carrying value of all noncontrolling interests
Carrying value at beginning of the period				$ 32,247
Distributions				(402)
Allocation of net income				296
Carrying value at end of the period				32,141
Noncontrolling interests | Realty Income, L.P.
Change in the carrying value of all noncontrolling interests
Carrying value at beginning of the period				24,100
Distributions				(326)
Allocation of net income				252
Carrying value at end of the period				24,026
Noncontrolling interests | Other Noncontrolling Interests
Change in the carrying value of all noncontrolling interests
Carrying value at beginning of the period				8,147
Distributions				(76)
Allocation of net income				43
Carrying value at end of the period				$ 8,114

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The cash outflow or inflow increase (decrease) in distribution due to real estate partnership based upon payments and accruals.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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