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Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2021 USD ($)
Re-leasing costs, recurring capital expenditures, and non-recurring building improvements
Commitments and Contingencies [Line Items]
Other commitments	$ 6.9
Construction contracts
Commitments and Contingencies [Line Items]
Other commitments	$ 90.1

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=o_ReLeasingCostsRecurringCapitalExpendituresNonRecurringBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=us-gaap_ConstructionContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: