Quarterly report pursuant to Section 13 or 15(d)

Realty Income Office Assets, Investments in Real Estate - Narrative (Details)

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Realty Income Office Assets, Investments in Real Estate - Narrative (Details) - Realty Income Office Assets - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 4.8 $ 6.0
Amortization of above and below market leases $ 0.8 $ 0.6