CAPITAL STOCK Net Settlement of LTIP (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
Apr. 04, 2026	Mar. 29, 2025
Equity [Abstract]
Number of shares repurchased under settlement of employee tax withholding obligations	0.1	0.1
Shares repurchased aggregate value under settlement of employee tax withholding obligations	$ 19.8	$ 13.0

Shares repurchased aggregate value under settlement of employee tax withholding obligations.

No definition available.

Name:	itt_SharesRepurchasedAggregateValueUnderSettlementOfEmployeeTaxWithholdingObligations
Namespace Prefix:	itt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration