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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2015
Dividends received from equity investments $ 30.3us-gaap_EquityMethodInvestmentDividendsOrDistributions   $ 44.3us-gaap_EquityMethodInvestmentDividendsOrDistributions  
Percentage of LIFO inventory 52.00%us-gaap_PercentageOfLIFOInventory 45.00%us-gaap_PercentageOfLIFOInventory    
Allowance for doubtful accounts receivable, current 34.1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 35.4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent    
Customer Refund Liability, Current 4.7us-gaap_CustomerRefundLiabilityCurrent 1.7us-gaap_CustomerRefundLiabilityCurrent    
Deferred Sales Inducements, Net 73.4us-gaap_DeferredSalesInducementsNet 80.1us-gaap_DeferredSalesInducementsNet    
Research and development expense 212.3us-gaap_ResearchAndDevelopmentExpense 218.2us-gaap_ResearchAndDevelopmentExpense 235.4us-gaap_ResearchAndDevelopmentExpense  
Effect of Exchange Rate on Cash and Cash Equivalents (148.7)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 6.1us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (23.6)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents  
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 991.7us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 798.8us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 882.5us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations  
Reclassification adjustment [Member]        
Increase (Decrease) In Selling Administrative Expense   (48.0)ir_IncreaseDecreaseInSellingAdministrativeExpense
/ us-gaap_StatementScenarioAxis
= ir_ReclassificationadjustmentMember
   
Increase (Decrease) In Cost Of Goods Sold   48.0ir_IncreaseDecreaseInCostOfGoodsSold
/ us-gaap_StatementScenarioAxis
= ir_ReclassificationadjustmentMember
   
Cameron acquisition [Member]        
Payments to Acquire Businesses, Gross       850us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_StatementScenarioAxis
= ir_CameronacquisitionMember
Ownership Percentage Policy Minimum [Member]        
Equity Method Investment, Ownership Percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementScenarioAxis
= ir_EquityMethodInvestmentOwnershipPercentagePolicyMinimumMember
     
Ownership Percentage Policy Maximum [Member]        
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementScenarioAxis
= ir_EquityMethodInvestmentOwnershipPercentagePolicyMaximumMember
     
Restatement Adjustment [Member]        
Effect of Exchange Rate on Cash and Cash Equivalents   78.9us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
(14.4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
 
Net Cash Provided by (Used in) Operating Activities, Continuing Operations   (78.9)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
14.4us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
 
Hussmann Divestiture [Member]        
Dividends received from equity investments 30.3us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_HussmannDivestitureMember
  44.3us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_HussmannDivestitureMember
 
Accounting Standards Update 2013 - 11 [Member]        
Deferred Tax Assets, Gross, Current (21.9)us-gaap_DeferredTaxAssetsGrossCurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
(22.6)us-gaap_DeferredTaxAssetsGrossCurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
   
Deferred Tax Assets, Gross, Noncurrent (10.0)us-gaap_DeferredTaxAssetsGrossNoncurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
(20.7)us-gaap_DeferredTaxAssetsGrossNoncurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
   
Deferred Tax Liabilities, Net, Noncurrent 114.8us-gaap_DeferredTaxLiabilitiesNoncurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
128.9us-gaap_DeferredTaxLiabilitiesNoncurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
   
Liability for Uncertain Tax Positions, Noncurrent $ (146.7)us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member
$ (172.2)us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
/ us-gaap_ProspectiveAdoptionOfNewAccountingPronouncementsAxis
= ir_AccountingStandardsUpdate201311Member