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Investments in Real Estate - Acquisitions Narrative (Details) - Real Estate Investment - USD ($) | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Investments in real estate properties |  |
Contingent consideration associated with acquisitions | $ 0 | $ 0
Revenue generated from acquired properties during the period | 27,500,000 | 47,100,000
Net income generated from acquired properties during the period | $ 9,400,000 | $ 21,900,000

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- Definition Asset Acquisition, Contingent Consideration, Liability + References No definition available. + Details
Name: | o_AssetAcquisitionContingentConsiderationLiability
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Asset Acquisition, Pro Forma Information, Earnings Or Loss Of Acquired Properties Since Acquisition Date, Actual + References No definition available. + Details
Name: | o_AssetAcquisitionProFormaInformationEarningsOrLossOfAcquiredPropertiesSinceAcquisitionDateActual
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Asset Acquisition, Pro Forma Information, Revenue Of Acquired Properties Since Acquisition Date, Actual + References No definition available. + Details
Name: | o_AssetAcquisitionProFormaInformationRevenueOfAcquiredPropertiesSinceAcquisitionDateActual
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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 No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_RealEstateInvestmentMember
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Data Type: | na
Balance Type: |
Period Type: |