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Noncontrolling Interests - Narrative (Details) | Mar. 31, 2020 noncontrolling_interest
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Noncontrolling Interest [Abstract] |
Number of noncontrolling interests consolidated | 2

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- Definition Number Of Noncontrolling Interests Consolidated + References No definition available. + Details
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Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration