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