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Leases - Lessee Arrangements (Details) $ in Millions	Mar. 31, 2021 USD ($)
Leases [Abstract]
Lessee right-of-use asset	$ 79.9

X

- Definition

Amount of lessee's right to use underlying asset under operating and finance leases.

+ References

No definition available.

+ Details

Name:	ofc_LesseeRightofUseAsset
Namespace Prefix:	ofc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration