XML 106 R93.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Pension and Other Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution expense | $ 12.6 | $ 11.8 | $ 11.1
Accumulated benefit obligation | 272.5 | 296.4 |
Project benefit obligation for the pension plans with an accumulated benefit obligation in excess of plan assets | 228.3 | 247.5 |
Accumulated benefit obligation for the pension plans with an accumulated benefit obligation in excess of assets | 225.4 | 243.9 |
Fair value of plan assets for the pension plans with an accumulated benefit obligations in excess of plan assets | 150.2 | 158.2 |
Projected benefit obligation for the pension plans with an accumulated benefit less than plan assets | 46.9 | 52.8 |
Accumulated benefit obligation for the pension plans with an accumulated benefit obligation less than plan assets | 47.1 | 52.5 |
Fair value of plan assets for the pension plans with an accumulated benefit obligations less than plan assets | $ 54.1 | $ 58.5 |
Target asset allocation for the investment of the assets in equity securities minimum | 20.00% |  |
Target asset allocation for the investment of the assets in equity securities maximum | 25.00% |  |
Target asset allocation for the investment of the assets in fixed income securities minimum | 75.00% |  |
Target asset allocation for the investment of the assets in fixed income securities maximum | 80.00% |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 30.00% |  |
Target asset allocation for the investment of the assets in equity securities | 60.00% |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 40.00% |  |
Target asset allocation for the investment of the assets in equity securities | 70.00% |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and other postretirement plans | $ 5.2 |  |
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension and other postretirement plans | $ 2.0 |  |

X
- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate accumulated benefit obligation. + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateAccumulatedBenefitObligation
Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateFairValueOfPlanAssets
Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Defined benefit plan pension plans with accumulated benefit obligations less than plan assets aggregate projected benefit obligation. + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsLessThanPlanAssetsAggregateProjectedBenefitObligation
Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Defined Benefit Plan Target Allocation Percentage Of Asset Equity Securities + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetEquitySecurities
Namespace Prefix: | bdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities And Cash + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesAndCash
Namespace Prefix: | bdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities Range Maximum1 + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMaximum1
Namespace Prefix: | bdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities Range Minimum 1 + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMinimum1
Namespace Prefix: | bdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Maximum 1 + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMaximum1
Namespace Prefix: | bdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Minimum 1 + References No definition available. + Details
Name: | bdc_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMinimum1
Namespace Prefix: | bdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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=58242635&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=58740216&loc=d3e2417-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=58242635&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=58740216&loc=d3e2417-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: 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=58242635&loc=d3e4179-114921 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |