Postretirement Benefit Plans - Additional Information (Details) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) Participant shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Company contributions to defined contribution plans	$ 19.1	$ 19.4	$ 17.3
Shares of ITT Stock Held in Defined Contribution Plan | shares	0.1
Active participants in numerous defined benefit pension plans | Participant	880
Accumulated benefit obligation	$ 70.2	70.0
Assumed rate of future decrease in per capita cost of health care for 2031	4.50%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to postretirement plans	$ 5.1	$ 6.5
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year	5.0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year	$ 5.0
Pre Age Sixty Five [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed rate of future increase in per capita cost of health care for 2021	8.50%
Post-age 65 retirees [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed rate of future increase in per capita cost of health care for 2021	8.80%
International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	85.00%