Debt - Revolving Credit Agreement (Details) $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($) Rate	Dec. 31, 2025 USD ($)
2021 Revolving Credit Facility
Short-term Debt [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 700.0	$ 700.0
Line of Credit Facility, Maximum Borrowing Capacity	1,050.0	1,050.0
Line of Credit Facility, Incremental Borrowing Capacity Maximum	350.0	$ 350.0
2021 Revolving Credit Facility \| Minimum [Member] \| Base Rate
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%
2021 Revolving Credit Facility \| Maximum [Member] \| Base Rate
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.125%
2025 Revolving Credit Facility
Short-term Debt [Line Items]
Line of Credit Facility, Current Borrowing Capacity	1,100.0	$ 1,100.0
Line of Credit Facility, Maximum Borrowing Capacity	1,650.0	1,650.0
Line of Credit Facility, Incremental Borrowing Capacity Maximum	$ 550.0	$ 550.0
2025 Revolving Credit Facility \| Minimum [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.09%
2025 Revolving Credit Facility \| Minimum [Member] \| Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.785%
2025 Revolving Credit Facility \| Minimum [Member] \| Base Rate
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%	0.00%
2025 Revolving Credit Facility \| Maximum [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.225%
2025 Revolving Credit Facility \| Maximum [Member] \| Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.15%
2025 Revolving Credit Facility \| Maximum [Member] \| Base Rate
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.15%

Line of Credit Facility, Incremental Borrowing Capacity Maximum

No definition available.

Name:	itt_LineofCreditFacilityIncrementalBorrowingCapacityMaximum
Namespace Prefix:	itt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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