Investments in Real Estate - Schedule of Acquisitions (Details) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($) property
Real Estate [Line Items]
Number of Properties \| property	377
Investment	$ 4,637.5
Initial weighted average cash yield (as a percent)	7.00%
Weighted Average Lease Term (Years)	10 years 8 months 12 days
Settlement credits as reimbursement for acquired rent free period	$ 6.5
Rental revenue generated from acquisitions from investment grade tenants (as a percent)	40.00%
Retail
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	70.40%
Industrial
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	29.10%
Other Property
Real Estate [Line Items]
Property type acquired based on rental revenue (as a percent)	0.50%
New properties
Real Estate [Line Items]
Number of Properties, Acquisitions \| property	268
Investment	$ 4,152.1
Initial weighted average cash yield (as a percent)	7.00%
Weighted Average Lease Term (Years)	10 years 1 month 6 days
New properties \| U.S. real estate
Real Estate [Line Items]
Number of Properties, Acquisitions \| property	180
Investment	$ 1,240.3
Weighted Average Lease Term (Years)	13 years 8 months 12 days
New properties \| Europe real estate
Real Estate [Line Items]
Number of Properties, Acquisitions \| property	88
Investment	$ 2,911.8
Weighted Average Lease Term (Years)	8 years 8 months 12 days
Properties under development
Real Estate [Line Items]
Number of Properties, Real Estate Properties Under Development \| property	109
Investment	$ 485.4
Initial weighted average cash yield (as a percent)	7.40%
Weighted Average Lease Term (Years)	14 years 10 months 24 days
Properties under development \| U.S. real estate
Real Estate [Line Items]
Number of Properties, Real Estate Properties Under Development \| property	91
Investment	$ 285.7
Weighted Average Lease Term (Years)	16 years 7 months 6 days
Properties under development \| Europe real estate
Real Estate [Line Items]
Number of Properties, Real Estate Properties Under Development \| property	18
Investment	$ 199.7
Weighted Average Lease Term (Years)	12 years 6 months

Represents the percentage of the real estate properties acquired during the period by the type of real estate.

No definition available.

Name:	o_AcquiredPropertiesPercentageByTypeOfRealEstate
Namespace Prefix:	o_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Asset Acquisition, Initial Average Cash Lease Yield For Acquired Properties, Percentage

+ References

No definition available.

+ Details

Name:	o_AssetAcquisitionInitialAverageCashLeaseYieldForAcquiredPropertiesPercentage
Namespace Prefix:	o_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Real Estate Property Investments, Number Of New Properties

+ References

No definition available.

+ Details

Name:	o_RealEstatePropertyInvestmentsNumberOfNewProperties
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of new properties and properties under development in which the entity invested during the period.

+ References

No definition available.

+ Details

Name:	o_RealEstatePropertyInvestmentsNumberOfNewPropertiesAndPropertiesUnderDevelopment
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Real Estate Property Investments, Number Of Properties Under Development

+ References

No definition available.

+ Details

Name:	o_RealEstatePropertyInvestmentsNumberOfPropertiesUnderDevelopment
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the net assets recorded as part of the real estate acquisition.

+ References

No definition available.

+ Details

Name:	o_RealEstatePropertyInvestmentsValueOfPropertiesAcquired
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Rental Revenue Generated From Acquisitions, Investment Grade Tenants, Percentage

+ References

No definition available.

+ Details

Name:	o_RentalRevenueGeneratedFromAcquisitionsInvestmentGradeTenantsPercentage
Namespace Prefix:	o_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Settlement Credits For Acquired Properties As Reimbursement For Rent Free Period

+ References

No definition available.

+ Details

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

- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

+ Details

Name:	us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 976
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477332/976-310-50-1

+ Details

Name:	us-gaap_RealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_IndustrialPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OtherPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=o_PropertiesNewMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=o_PropertiesUnderDevelopmentOrExpansionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: