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EARNINGS PER SHARE DATA - Number of Shares Underlying Stock Options Excluded from the Computation of Diluted Earnings (Loss) (Detail) - $ / shares shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Number of PSU Awards Excluded from Diluted Shares Outstanding | 0.1 | 0.3 | 0.1 | 0.3
Anti-dilutive stock options |  | 0.4 | 0.0 | 0.4
Average exercise price |  | $ 42.30 |  | $ 42.41
Minimum [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Years of expiration |  |  |  | 2024
Maximum [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Years of expiration |  |  |  | 2025

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- Definition This element represents the average exercise prices of securities that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. + References No definition available. + Details
Name: | itt_AverageExercisePriceOfAntiDilutiveStockOptions
Namespace Prefix: | itt_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of ROIC Awards Excluded from Diluted Shares Outstanding + References No definition available. + Details
Name: | itt_NumberofROICAwardsExcludedfromDilutedSharesOutstanding
Namespace Prefix: | itt_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Years of expiration for anti-dilutive stock options. + References No definition available. + Details
Name: | itt_YearsOfExpirationForAntiDilutiveStockOptions
Namespace Prefix: | itt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |