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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 13, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Loss) income from discontinued operations, including tax benefit of $4.8, $0.2, and $5.9, respectively $ (3.9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 0.8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 15.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax  
Loss due to settlement of a Legacy discontinued operations business 1.3itt_LossduetosettlementofaLegacydiscontinuedoperationsbusiness      
Shape Cutting Businesses [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Loss) income from discontinued operations, including tax benefit of $4.8, $0.2, and $5.9, respectively     9.6us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= itt_ShapeCuttingBusinessMember
 
Proceeds from sale of segment       38.4us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= itt_ShapeCuttingBusinessMember
Earnings from discontinued operations before income taxes     $ 0.6us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= itt_ShapeCuttingBusinessMember