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Investments in Real Estate- Gain on Sales of Real Estate (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) property | Sep. 30, 2021 USD ($) property | Sep. 30, 2022 USD ($) property | Sep. 30, 2021 USD ($) property
Properties sold during the period |  |  |  |
Number of properties | property | 34 | 27 | 138 | 96
Net sales proceeds | $ 142.2 | $ 31.9 | $ 414.4 | $ 123.5
Gain on sales of real estate | $ 42.6 | $ 12.1 | $ 93.4 | $ 35.4

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- Definition Gain (Loss) on Sale of Properties, Excluding Additional Proceeds Received + References No definition available. + Details
Name: | o_GainLossOnSaleOfPropertiesExcludingAdditionalProceedsReceived
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds From Sale Of Property Held For Sale, Including Property Swap, Net + References No definition available. + Details
Name: | o_ProceedsFromSaleOfPropertyHeldForSaleIncludingPropertySwapNet
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of real estate properties sold during the period. + References No definition available. + Details
Name: | o_PropertySalesCount
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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