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Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution expense | $ 11.8 us-gaap_DefinedContributionPlanCostRecognized | $ 11.1 us-gaap_DefinedContributionPlanCostRecognized | $ 10.9 us-gaap_DefinedContributionPlanCostRecognized
Accumulated benefit obligation | 296.4 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation | 254.5 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |
Project benefit obligation for the pension plans with an accumulated benefit obligation in excess of plan assets | 247.5 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation | 77.0 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation |
Accumulated benefit obligation for the pension plans with an accumulated benefit obligation in excess of assets | 243.9 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation | 75.1 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation |
Fair value of plan assets for the pension plans with an accumulated benefit obligations in excess of plan assets | 158.2 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets | 11.1 us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets |
Projected benefit obligation for the pension plans with an accumulated benefit less than plan assets | 52.8 bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateBenefitObligation | 181.4 bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateBenefitObligation |
Accumulated benefit obligation for the pension plans with an accumulated benefit obligation less than plan assets | 52.5 bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateAccumulatedBenefitObligation | 179.4 bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateAccumulatedBenefitObligation |
Fair value of plan assets for the pension plans with an accumulated benefit obligations less than plan assets | 58.5 bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateFairValueOfPlanAssets | 187.2 bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateFairValueOfPlanAssets |
Target asset allocation for the investment of the assets in equity securities minimum | 20.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMinimum1 |  |
Target asset allocation for the investment of the assets in equity securities maximum | 25.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMaximum1 |  |
Target asset allocation for the investment of the assets in fixed income securities minimum | 75.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMinimum1 |  |
Target asset allocation for the investment of the assets in fixed income securities maximum | 80.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMaximum1 |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 30.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesAndCash / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Target asset allocation for the investment of the assets in equity securities | 60.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetEquitySecurities / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 40.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesAndCash / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Target asset allocation for the investment of the assets in equity securities | 70.00%bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetEquitySecurities / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and other postretirement plans | 5.8 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |  |
Other Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and other postretirement plans | $ 2.2 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember |  |

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- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate accumulated benefit obligation. + References No definition available. + Details
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- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate benefit obligation. + References No definition available. + Details
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- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate fair value of plan assets. + References No definition available. + Details
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- Definition Defined Benefit Plan Target Allocation Percentage Of Asset Equity Securities + References No definition available. + Details
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- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities And Cash + References No definition available. + Details
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- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Maximum 1 + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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