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Summary of Significant Accounting Policies and Procedures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Rental revenue reserves	$ 8.3	$ 1.1
Straight-line rent reserves	0.5	0.7
Total rental revenue reserves	$ 8.8	$ 1.8

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- Definition

Reserves Recorded For Straight-Line Rent

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Reserves Recorded For Uncollectible Rental Revenue

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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

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No definition available.

+ Details

Name:	o_ReservesRecordedForUncollectibleRentalRevenueAndStraightLineRent
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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