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Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 employee | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 163.3 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation | $ 143.5 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |
Increase in pension plan obligations | 4.9 us-gaap_IncreaseDecreaseInPensionPlanObligations |  |
Percentage of excess gains and losses over benefit obligation or market value of assets amortized | 10.00%iex_ExcessGainsAndLossesOverBenefitObligationOrMarketValueOfAssetsAmortized |  |
Costs of defined contribution plans | 9.1 us-gaap_DefinedContributionPlanCostRecognized | 8.4 us-gaap_DefinedContributionPlanCostRecognized | 7.9 us-gaap_DefinedContributionPlanCostRecognized
Number of participants covering under multi employer pension plan | 395 iex_NumberOfParticipatesCoveringUnderMultiEmployerPensionPlan |  |
Costs of bargaining unit-sponsored multi-employer plans and defined contribution plans | 1.0 us-gaap_MultiemployerPlanPeriodContributions | 1.1 us-gaap_MultiemployerPlanPeriodContributions | 1.0 us-gaap_MultiemployerPlanPeriodContributions
Weighted average annual rate of increase in the per capita cost of covered health care benefits assumed | 7.12%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate |  |
Assumed decrease of weighted average health care cost trend rate | 4.50%iex_AssumedDecreaseOfWeightedAverageHealthCareCostTrendRate |  |
Year that reaches assumed decrease of weighted average health care cost trend rate | 2027 |  |
Increase in service and interest cost components of the net periodic benefit cost, as 1% increase in health care cost trend rates | 0.1 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents |  |
Increase in accumulated postretirement benefit obligation, as 1% increase in health care cost trend rates | 1.6 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation |  |
Decrease in service and interest cost components of the net periodic benefit cost, as 1% decrease in health care cost trend rates | 0.1 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1 |  |
Decrease in accumulated postretirement benefit obligation, as 1% decrease in health care cost trend rates | 1.4 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1 |  |
Future estimated benefit payments for year 2015 | 9.0 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths |  |
Future estimated benefit payments for year 2016 | 9.6 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo |  |
Future estimated benefit payments for year 2017 | 10.1 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree |  |
Future estimated benefit payments for year 2018 | 10.7 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour |  |
Future estimated benefit payments for year 2019 | 10.7 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive |  |
Future estimated benefit payments for years 2020 to 2025 | 54.0 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter |  |
Defined Contribution Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, expected contribution for next fiscal year | 9.1 iex_DefinedContributionPlanExpectedEmployerContributionAmount / us-gaap_DefinedContributionPlanNameAxis = iex_DefinedContributionPlanMember |  |
401k |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, expected contribution for next fiscal year | 8.0 iex_DefinedContributionPlanExpectedEmployerContributionAmount / us-gaap_DefinedContributionPlanNameAxis = iex_DefinedContributionPensionPlanFourZeroOneKMember |  |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected contribution for next fiscal year | 1.6 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |  |
Other Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected contribution for next fiscal year | $ 0.5 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of fund assets in equities, minimum | 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Target allocation of fund assets in equities, maximum | 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Target allocation of fund assets in equities | 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of fund assets in equities, minimum | 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |
Target allocation of fund assets in equities, maximum | 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |
Target allocation of fund assets in equities | 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |

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- Definition Excess gains and losses over benefit obligation or market value of assets amortized + References No definition available. + Details
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- Definition Number of participates covering under multi employer pension plan. + 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 Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + 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 Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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 (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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 (l) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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