Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Contributions, Benefit Payments and Other (Details)

v2.4.1.9
Postretirement Benefits Contributions, Benefit Payments and Other (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Expected Benefit Payments [Abstract]    
Amortization of prior service costs (credits) for former/inactive employees $ 1.3bc_DefinedBenefitPlanAmortizationOfPriorServiceCostCreditFormerInactiveEmployees $ 1.3bc_DefinedBenefitPlanAmortizationOfPriorServiceCostCreditFormerInactiveEmployees
Next fiscal year amortization of prior service costs (credits) for former/inactive employees 0.6bc_DefinedBenefitPlanAmortizationOfPriorServiceCostCreditFormerInactiveEmployeesNextFiscalYear  
Pension Plans [Member]    
Expected Benefit Payments [Abstract]    
Company contributions expected to be made in 2015 73.8us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
[1]  
2015 81.5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
[2]  
2016 82.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
2017 82.6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
2018 82.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
2019 82.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
2020-2024 394.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Defined Benefit Plan Estimated Future Employer Required Contributions In Next Fiscal Year Qualified Plan 70.0bc_DefinedBenefitPlanEstimatedFutureEmployerRequiredContributionsInNextFiscalYearQualifiedPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Unfunded Plan 3.8bc_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearUnfundedPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Defined benefit plan, estimated lump sum payments in next fiscal year 70bc_DefinedbenefitplanEstimatedsettlementpaymentsinnextfiscalyear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Other Postretirement Benefit Plans [Member]    
Expected Benefit Payments [Abstract]    
Company contributions expected to be made in 2015 4.9us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
[1]  
2015 4.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
2016 4.6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
2017 4.4us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
2018 4.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
2019 3.8us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
2020-2024 $ 15.2us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
 
[1] The Company currently anticipates contributing approximately $70.0 million to fund the qualified pension plans and approximately $3.8 million to cover benefit payments in the unfunded, nonqualified pension plan in 2015. Company contributions are subject to change based on market conditions or Company discretion.
[2] In addition to the 2015 expected pension benefit payments of $81.5 million, estimated lump sum pension settlement payments of $70 million are expected to be made in 2015.