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Debt - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Short-term loans | $ 0 |
ITT 2014 Revolving Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Revolving credit facility | 500,000,000 |
Maximum face amount outstanding on letters of credit | 100,000,000 |
Minimum amount of reduce commitments | 10,000,000 |
Maximum potential increase in credit facility | 200,000,000 |
Maximum potential credit facility outstanding | $ 700,000,000 |
Maximum Leverage Ratio Under Credit Facility | 3.00 |
Minimum leverage ratio under credit facility | 1.00 |
Maximum interest coverage ratio under credit facility | 3.00 |
Minimum interest coverage ratio under credit facility | 1.00 |
Commercial Paper [Member] |  |
Debt Instrument [Line Items] |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 0.05% | 0.06%

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- Definition Maximum face amount outstanding on letters of credit. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum interest coverage ratio under credit facility. + References No definition available. + Details
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Namespace Prefix: | itt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum leverage ratio under credit facility. + References No definition available. + Details
Name: | itt_MaximumLeverageRatioUnderCreditFacility
Namespace Prefix: | itt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum potential credit facility outstanding. + References No definition available. + Details
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Namespace Prefix: | itt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maximum potential increase in credit facility + References No definition available. + Details
Name: | itt_MaximumPotentialIncreaseInCreditFacility
Namespace Prefix: | itt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of reduce commitments. + References No definition available. + Details
Name: | itt_MinimumAmountOfReduceCommitments
Namespace Prefix: | itt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Minimum interest coverage ratio under credit facility. + References No definition available. + Details
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- Definition Minimum leverage ratio under credit facility. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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Period Type: |