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Divestitures and Discontinued Operations (Net Revenues and After-Tax Earnings) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net revenues $ 0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 1,889.9us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 2,046.6us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Discontinued operations, net of tax 34.7us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 13.3us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 252.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Allegion [Member]      
Net revenues 0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_AllegionMember
1,889.9us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_AllegionMember
2,046.6us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_AllegionMember
Discontinued operations, net of tax $ 15.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_AllegionMember
$ 12.4us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_AllegionMember
$ 254.2us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= ir_AllegionMember