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Earnings Per Share - Number of Shares Underlying Stock Options Excluded from Computation of Diluted Loss (Detail) - $ / shares shares in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive stock options | 0.3 | 0.7 | 0.4
Average exercise price | $ 42.43 | $ 38.34 | $ 42.50
Performance Shares [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive stock options | 0.1 | 0.1 | 0.1
Minimum [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Year(s) of expiration | 2024 | 2024 | 2024
Maximum [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Year(s) of expiration | 2025 | 2026 | 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 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://www.xbrl.org/2003/role/presentationRef -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
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Balance Type: | na
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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
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- Details
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- Details
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- Details
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