Investments in Real Estate - Acquisitions (Details) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($)
Real Estate [Abstract]
Revenue generated from acquired properties during the period	$ 33.6
Net income generated from acquired properties during the period	$ 8.6

Asset Acquisition, Pro Forma Information, Earnings Or Loss Of Acquired Properties Since Acquisition Date, Actual

No definition available.

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