Self-Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Self Insurance Reserves [Abstract]
Self insurance reserve	$ 130.7	$ 153.0
Self insurance reserves, noncurrent	75.4	88.4
Accrual receivable	14.3	18.0
Cash deposits for self insured retention risk	15.8	15.8
Letters of credit associated to the secured self-insured retention risk	62.1	61.3
Cash deposit to collateralize the insurance policy	$ 6.5	$ 7.7

The total amount of cash and letters of credit associated to the secured self-insured retention risk.

No definition available.

Name:	bkd_CashAndLettersOfCreditForSelfInsuredRetentionRisk
Namespace Prefix:	bkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash deposit to collateralize the insurance policy

+ References

No definition available.

+ Details

Name:	bkd_CashDepositToCollateralizeTheInsurancePolicy
Namespace Prefix:	bkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Self Insurance Reserves [Abstract]

+ References

No definition available.

+ Details

Name:	bkd_SelfInsuranceReservesAbstract
Namespace Prefix:	bkd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Self- Insurance Reserves, Cash Deposits For Self Insured Retention Risk

+ References

No definition available.

+ Details

Name:	bkd_SelfInsuranceReservesCashDepositsForSelfInsuredRetentionRisk
Namespace Prefix:	bkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12053-110248

+ Details

Name:	us-gaap_LossContingencyReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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