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DEBT - Subsequent Event (Details) - 2021 Revolving Credit Facility Member - Subsequent Event [Member] $ in Millions | Aug. 05, 2021 USD ($) Rate
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Subsequent Event [Line Items] |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate | 0.15%
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,050
Line of Credit Facility, Interest Margin Above LIBOR | Rate | 1.10%
Line of Credit Facility, Aggregate Borrowing Capacity | $ 700
Line of Credit Facility, Incremental Borrowing Capacity Maximum | $ 350

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- Definition Line of Credit Facility, Aggregate Borrowing Capacity + References No definition available. + Details
Name: | itt_LineofCreditFacilityAggregateBorrowingCapacity
Namespace Prefix: | itt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Incremental Borrowing Capacity Maximum + References No definition available. + Details
Name: | itt_LineofCreditFacilityIncrementalBorrowingCapacityMaximum
Namespace Prefix: | itt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Interest Margin Above LIBOR + References No definition available. + Details
Name: | itt_LineofCreditFacilityInterestMarginAboveLIBOR
Namespace Prefix: | itt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the 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=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=itt_A2021RevolvingCreditFacilityMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |