Merger with Spirit Realty Capital, Inc. - Schedule of Fair Value of the Consideration Transferred on the Date of the Acquisition (Details) $ / shares in Units, $ in Thousands		1 Months Ended
	Jan. 23, 2024 USD ($) $ / shares shares	Sep. 30, 2024 shares	Mar. 31, 2025 shares	Dec. 31, 2024 shares
Fair value of the consideration transferred on the date of the acquisition
Common stock and paid in capital, outstanding (in shares) | shares			903,062,000	891,511,000
Spirit Realty Capital, Inc.
Fair value of the consideration transferred on the date of the acquisition
Shares of Spirit common stock exchanged (in shares) | shares	142,136,567
Exchange Ratio	0.762
Shares of Realty Income common stock issued (in shares) | shares	108,308,064
Opening price of Realty Income common stock and Series A Preferred Stock on January 23, 2024 (in dollars per share) | $ / shares	$ 55.80
Fair value of Realty Income common stock and Series A Preferred Stock issued to the former holders of Spirit common stock and Series A Preferred Stock	$ 6,043,590
Shares of Realty Income Series A Preferred Stock issued in exchange for Spirit Series A Preferred Stock (in shares) | shares	6,900,000	6,900,000
Cash paid for fractional shares	$ 51
Less: Fair value of Spirit restricted stock and performance awards attributable to post-combination costs	(24,751)
Consideration transferred	6,186,284
Fair value of pre-combination services	$ 41,700
Spirit Realty Capital, Inc. | Series A Preferred Stock
Fair value of the consideration transferred on the date of the acquisition
Opening price of Realty Income common stock and Series A Preferred Stock on January 23, 2024 (in dollars per share) | $ / shares	$ 24.26
Fair value of Realty Income common stock and Series A Preferred Stock issued to the former holders of Spirit common stock and Series A Preferred Stock	$ 167,394
Spirit Realty Capital, Inc.
Fair value of the consideration transferred on the date of the acquisition
Common stock and paid in capital, outstanding (in shares) | shares	142,100,000