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Other, Net (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Foreign Currency Transaction Gain (Loss), before Tax $ (0.1)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ (14.0)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 0.2us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Devaluation of Venezuela Bolivar [Member]      
Foreign Currency Transaction Gain (Loss), before Tax   3.8us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= ir_DevaluationOfVenezuelaBolivarMember
 
Hussmann Business Equity Ownership [Member]      
Earnings (loss) from equity investments 7.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ir_HussmannbusinessequityownershipMember
(2.6)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ir_HussmannbusinessequityownershipMember
(5.9)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ir_HussmannbusinessequityownershipMember
Equity Method Investment, Ownership Percentage 37.20%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ir_HussmannbusinessequityownershipMember
   
March 2014 [Domain]      
Gain on Sale of Investments $ 6.0us-gaap_GainOnSaleOfInvestments
/ us-gaap_BusinessAcquisitionAxis
= ir_March2014Domain