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Summary of Significant Accounting Policies and Procedures and New Accounting Standards - Reserves of Rental Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |
Rental revenue reserves | $ 10.2 | $ 44.1 | $ 1.4
Straight-line rent reserves | 4.5 | 8.4 | 1.5
Total rental revenue reserves | $ 14.7 | $ 52.5 | $ 2.9

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- Definition Reserves (Reversals) Recorded For Straight-Line Rent + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Reserves (Reversals) Recorded For Uncollectible Rental Revenue + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Reserves (Reversals) 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
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