Supplemental Disclosures of Cash Flow Information - Summary (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Supplemental disclosures:
Cash paid for interest	$ 501,162	$ 363,518
Cash paid for income taxes	11,462	42,225
Non-cash activities:
Increase in noncontrolling interests from property acquisitions	39,156	0
Mortgages assumed at fair value	0	45,079
Realty Income, L.P.
Non-cash activities:
Issuance of common partnership units of Realty Income, L.P.	0	51,221
Derivative
Non-cash activities:
Net (decrease) increase in fair value of derivatives	$ (51,386)	$ 146,310