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Commitments and Contingencies (Details) $ in Millions | Jun. 30, 2018 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Amount of commitments for re-leasing costs, recurring capital expenditures and non-recurring building improvements | $ 15.9
Amount of commitments for construction contracts, which is expected to be paid in next twelve months | $ 14.3

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- Definition General description of commitments required in performing under construction-type contracts at the balance sheet date. + References No definition available. + Details
Name: | o_CommitmentsToCompleteConstructionInProgress
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent payments for re-leasing costs, recurring capital expenditures and non-recurring building improvements. + References No definition available. + Details
Name: | o_ReleasingCostsRecurringCapitalExpendituresAndNonRecurringBuildingImprovementsContingentPayments
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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