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Income Taxes (Schedule of Reconciliation Between Statutory and Effective Tax Rate) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statutory U.S. rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Non US tax rate differential (14.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (26.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (22.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Tax on US subsidiaries on Non US earnings 1.70%ir_Taxonussubsidiariesonnonusearnings 2.00%ir_Taxonussubsidiariesonnonusearnings 4.10%ir_Taxonussubsidiariesonnonusearnings
State and local income taxes 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes [1] 6.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes [1] 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes [1]
Change in permanent reinvestment assertion 0.90%ir_Changeinpermanentreinvestmentassertion [2] 6.20%ir_Changeinpermanentreinvestmentassertion [2] 0.00%ir_Changeinpermanentreinvestmentassertion [2]
Valuation allowances (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (16.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Reserves for uncertain tax positions 0.30%ir_EffectiveIncomeTaxRateReconciliationTaxReservesIncludingUncertainTaxPositionReserves (2.90%)ir_EffectiveIncomeTaxRateReconciliationTaxReservesIncludingUncertainTaxPositionReserves 2.40%ir_EffectiveIncomeTaxRateReconciliationTaxReservesIncludingUncertainTaxPositionReserves
Impact of change in taxation of retiree drugs subsidy 0.00%ir_ImpactOfChangeInTaxationOfRetireeDrugsSubsidy 0.00%ir_ImpactOfChangeInTaxationOfRetireeDrugsSubsidy 1.90%ir_ImpactOfChangeInTaxationOfRetireeDrugsSubsidy
Provision to return and other true-up adjustments 0.10%ir_EffectiveIncomeTaxRateReconciliationProvisionToReturnAndOtherTrueUpAdjustments (0.70%)ir_EffectiveIncomeTaxRateReconciliationProvisionToReturnAndOtherTrueUpAdjustments (0.10%)ir_EffectiveIncomeTaxRateReconciliationProvisionToReturnAndOtherTrueUpAdjustments
Other adjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 24.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 22.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 6.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations
[1] Net of changes in valuation allowances
[2] Net of foreign tax credits