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COMMITMENTS AND CONTINGENCIES (Detail 2) (Environmental remediation unrelated to claims and legal proceedings, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Environmental remediation unrelated to claims and legal proceedings
     
Commitments and Contingencies Disclosure      
Operating expenses, net of insurance recoveries related to environmental liabilities $ 1.4us-gaap_LossContingencyLossInPeriod
/ us-gaap_EnvironmentalRemediationContingencyAxis
= bpl_EnvironmentalRemediationMember
$ 0.6us-gaap_LossContingencyLossInPeriod
/ us-gaap_EnvironmentalRemediationContingencyAxis
= bpl_EnvironmentalRemediationMember
 
Environmental remediation liabilities 52.3us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationContingencyAxis
= bpl_EnvironmentalRemediationMember
  52.3us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationContingencyAxis
= bpl_EnvironmentalRemediationMember
Receivables related to environmental remediation expenditures covered by insurance or third party claims $ 18.5us-gaap_InsuranceSettlementsReceivable
/ us-gaap_EnvironmentalRemediationContingencyAxis
= bpl_EnvironmentalRemediationMember
  $ 13.6us-gaap_InsuranceSettlementsReceivable
/ us-gaap_EnvironmentalRemediationContingencyAxis
= bpl_EnvironmentalRemediationMember