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Limited Partners' Non-Controlling Interests in the Parent Company (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Noncontrolling Interest [Abstract]
Aggregate amount related to non-controlling interests classified within equity	$ 9.4	$ 10.1
Settlement value of non controlling interest in operating partnership	$ 14.9	$ 12.6

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- Definition

Minority interest in operating partnerships settlement value.

+ References

No definition available.

+ Details

Name:	bdn_MinorityInterestInOperatingPartnershipsSettlementValue
Namespace Prefix:	bdn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of the equity interests owned by noncontrolling partners in an operating partnership included in the entity's consolidated financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestInOperatingPartnerships
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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