Supplemental Disclosures of Cash Flow Information - Summary (Details) $ in Thousands, £ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($) shares	Nov. 30, 2021 USD ($) shares	Dec. 31, 2023 USD ($) mortgage	Dec. 31, 2022 USD ($) mortgage property shares	Dec. 31, 2021 USD ($) sterlingDenominatedMortgage mortgage	Dec. 31, 2021 GBP (£) sterlingDenominatedMortgage mortgage
Supplemental disclosures:
Cash paid for interest			$ 692,004	$ 501,716	$ 355,483
Cash paid for income taxes			12,283	45,031	19,676
Cash paid for merger and integration-related costs			11,329	22,783	157,115
Non-cash activities:
Increase in noncontrolling interests from property acquisitions			39,156	0	0
Mortgages assumed at fair value			0	45,079	911,525
Notes payable assumed at fair value			0	0	4,946,965
Non-cash assets and liabilities assumed in merger			0	0	11,559,875
Non-cash assets and liabilities distributed in Orion Divestiture			0	0	1,142,121
Contributions by noncontrolling interests			$ 40,097	51,221	$ 43,390
Mortgages payable
Non-cash activities:
Mortgages assumed at fair value				$ 45,100		£ 31.0
Number of mortgages assumed during period			0	8	1	1
Mortgages payable | VEREIT Inc
Non-cash activities:
Mortgages assumed at fair value					$ 869,100
Number of mortgages assumed during period | mortgage					10	10
Realty Income, L.P.
Non-cash activities:
Issuance of common partnership units of Realty Income, L.P.			$ 0	$ 51,221	$ 38,783
Number of partnership units issued (in units) | shares	240,586	300,604		734,458
Partnership units, properties acquired | property				9
Contributions by noncontrolling interests	$ 16,600	$ 20,400
Realty Income, L.P. | VEREIT Inc
Non-cash activities:
Number of partnership units issued (in units) | shares		56,400
Contributions by noncontrolling interests		$ 1,800
Derivative
Non-cash activities:
Net (decrease) increase in fair value of derivatives			$ (116,145)	$ 58,753	$ 40,489