Investments in Real Estate- Gain on Sales of Real Estate (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property
Properties sold during the period
Number of properties \| property	168	154	126
Net sales proceeds	$ 434.9	$ 250.3	$ 262.5
Gain on sales of real estate	$ 102.7	$ 55.8	$ 76.2

Gain (Loss) on Sale of Properties, Excluding Additional Proceeds Received

No definition available.

Name:	o_GainLossOnSaleOfPropertiesExcludingAdditionalProceedsReceived
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration