Orion Office REIT Inc. Quarterly report pursuant to Section 13 or 15(d)

VEREIT Office Assets, Leases - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) property	Sep. 30, 2021 USD ($) lease property	Sep. 30, 2022 USD ($) property	Sep. 30, 2021 USD ($) lease property
Lessor, Lease, Description [Line Items]
Number of Properties \| property	87		87
Lessee, operating lease, discount rate	3.21%		3.21%
Operating lease, cost \| $	$ 0.3	$ 0.1	$ 0.8	$ 0.1
Minimum
Lessor, Lease, Description [Line Items]
Lessor, operating leases, term	1 month 6 days		1 month 6 days
Lessee, operating lease, remaining lease term	1 month 6 days		1 month 6 days
Maximum
Lessor, Lease, Description [Line Items]
Lessor, operating leases, term	15 years 6 months		15 years 6 months
Lessee, operating lease, remaining lease term	62 years 3 months 18 days		62 years 3 months 18 days
VEREIT Office Assets
Lessor, Lease, Description [Line Items]
Number of Properties \| property		52		52
Number of properties subject to ground leases \| lease		1		1
Lessee, operating lease, remaining lease term		35 years 10 months 24 days		35 years 10 months 24 days
Lessee, operating lease, discount rate		5.17%		5.17%
Operating lease, cost \| $		$ 0.1		$ 0.2
VEREIT Office Assets \| Minimum
Lessor, Lease, Description [Line Items]
Lessor, operating leases, term		29 days		29 days
VEREIT Office Assets \| Maximum
Lessor, Lease, Description [Line Items]
Lessor, operating leases, term		11 years 8 months 1 day		11 years 8 months 1 day