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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Other Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 121.7us-gaap_FiniteLivedIntangibleAssetsGross $ 126.4us-gaap_FiniteLivedIntangibleAssetsGross
Indefinite-lived intangible assets, Gross/Net Carrying Amount 25.2us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 26.3us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Other Intangible Assets, Gross Carrying Amount 146.9itt_FiniteAndInfiniteLivedIntangibleAssetsGross 152.7itt_FiniteAndInfiniteLivedIntangibleAssetsGross
Accumulated Amortization (61.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (61.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Finite-live intangible asset, net of accumulated amortization 60.2us-gaap_FiniteLivedIntangibleAssetsNet 65.1us-gaap_FiniteLivedIntangibleAssetsNet
Other intangible assets, net 85.4us-gaap_IntangibleAssetsNetExcludingGoodwill 91.4us-gaap_IntangibleAssetsNetExcludingGoodwill
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Customer Relationships, Gross Carrying Amount 81.0us-gaap_FiniteLivedCustomerRelationshipsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
83.1us-gaap_FiniteLivedCustomerRelationshipsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization (39.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(38.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-live intangible asset, net of accumulated amortization 41.9us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
44.8us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Proprietary technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Proprietary Technology, Gross Carrying Amount 26.7us-gaap_OtherFiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_ProprietaryTechnologyMember
28.1us-gaap_OtherFiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_ProprietaryTechnologyMember
Accumulated Amortization (10.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_ProprietaryTechnologyMember
(9.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_ProprietaryTechnologyMember
Finite-live intangible asset, net of accumulated amortization 16.6us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_ProprietaryTechnologyMember
18.2us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_ProprietaryTechnologyMember
Patents and other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Patents and Other, Gross Carrying Amount 14.0us-gaap_FiniteLivedPatentsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_PatentsAndOtherMember
15.2us-gaap_FiniteLivedPatentsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_PatentsAndOtherMember
Accumulated Amortization (12.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_PatentsAndOtherMember
(13.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_PatentsAndOtherMember
Finite-live intangible asset, net of accumulated amortization $ 1.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_PatentsAndOtherMember
$ 2.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= itt_PatentsAndOtherMember