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Impairments (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) property item | Mar. 31, 2016 USD ($) property item
Impairments |  |
Total Provisions for impairment | $ | $ 5.4 | $ 1.9
Number of impaired properties held-for-sale | 5 |
Number of impaired properties held-for-investment | 3 |
Number of impaired properties sold | 1 | 8
Number of industries | item | 5 | 7

X
- Definition The number of impaired properties held-for-investment. + References No definition available. + Details
Name: | o_ImpairedPropertiesHeldForInvestmentNumber
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of impaired properties held-for-sale. + References No definition available. + Details
Name: | o_ImpairedPropertiesHeldForSellNumber
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of impaired properties sold. + References No definition available. + Details
Name: | o_ImpairedPropertiesSoldNumber
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of industries in which the properties belongs which have been impaired. + References No definition available. + Details
Name: | o_NumberOfIndustries
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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