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Self-Insurance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Self-Insurance [Abstract]
Loss Contingency, Receivable, Total	$ 52.7us-gaap_LossContingencyReceivable	$ 16.0us-gaap_LossContingencyReceivable
Self-insured portions of programs accrued, total	301.6bkd_SelfInsuredPortionsOfProgramsAccruedCurrentAndNoncurrent	76.6bkd_SelfInsuredPortionsOfProgramsAccruedCurrentAndNoncurrent
Accrued self-insured portions of programs , noncurrent	184.7bkd_AccruedSelfInsuredPortionsOfProgramsNoncurrent	45.3bkd_AccruedSelfInsuredPortionsOfProgramsNoncurrent
Secured self-insured retention risk under workers' compensation, general liability, and professional liability programs with cash	19.6us-gaap_SelfInsuranceReserveNoncurrent	18.6us-gaap_SelfInsuranceReserveNoncurrent
Letters of credit associated to the secured self-insured retention risk	33.8bkd_CashAndLettersOfCreditForSelfInsuredRetentionRisk	34.2bkd_CashAndLettersOfCreditForSelfInsuredRetentionRisk
Cash deposit to collateralize the insurance policy	$ 51.9bkd_CashDepositToCollateralizeTheInsurancePolicy

X

- Definition

This element represent noncurrent self-insured portion of expected losses plus incurred but not reported claims as of the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- 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

X

- Definition

This element represent self-insured portion of expected losses plus incurred but not reported claims due as of the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248

+ Details

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

X

- 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