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v3.20.4

Summary of Significant Accounting Policies and Procedures and Newly Adopted Accounting Standards - Reserves of Rental Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Rental revenue reserves | $ 44.1 | $ 1.4 | $ 1.1
Straight-line rent reserves | 8.4 | 1.5 | 0.2
Total rental revenue reserves | $ 52.5 | $ 2.9 | $ 1.3

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- Definition Reserves Recorded For Straight-Line Rent + References No definition available. + Details
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Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reserves Recorded For Uncollectible Rental Revenue + References No definition available. + Details
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Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reserves Recorded For Uncollectible Rental Revenue And Straight-Line Rent + References No definition available. + Details
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Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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