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Provisions for Impairments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($) property	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($) property
Provisions for impairment
Provisions for impairment | $	$ 17,246	$ 13,869	$ 19,966	$ 18,347
Number of impaired properties held for sale	14	1	14	1
Number of impaired properties held for investment	5	7	9	7
Number of impaired properties sold	18	17	28	28
Additional Disclosures by Disposal Groups [Line Items]
Number of properties owned	6,761		6,761
Held-for-sale
Additional Disclosures by Disposal Groups [Line Items]
Number of properties owned	33		33

X

- Definition

The number of impaired properties held-for-investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	o_
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Balance Type:	na
Period Type:	duration

X

- Definition

The number of impaired properties held for sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	o_
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Balance Type:	na
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X

- Definition

The number of impaired properties sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

+ Details

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Balance Type:	debit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- References

No definition available.

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- Details

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