Postretirement Benefit Plans - Additional Information (Details) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Participant shares	Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Company contributions to defined contribution plans	$ 16.5	$ 14.5		$ 10.6
Shares of ITT Stock Held in Defined Contribution Plan | shares	0.1
Active participants in numerous defined benefit pension plans | Participant	980
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 8.1	0.0
Pension settlement charges	0.0	0.0		137.0
Accumulated benefit obligation	$ 77.5	105.5
Assumed rate of future decrease in per capita cost of health care for 2028	4.50%
Contributions to postretirement plans	$ 11.0	10.5		18.0
Employer contributions	11.0	10.5
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charges	0.0	(3.4)	[1]	137.0	[1]
Contributions to postretirement plans	3.9	4.3
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year	6.0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	8.1	0.0
Employer contributions	7.1	6.2
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year	$ 7.0
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	7.50%
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	6.50%
International Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	86.00%
International Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 0.0	0.0
Pension settlement charges	0.0	0.0		0.1
Employer contributions	3.0	3.4
United States | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0.0	0.0
Pension settlement charges	0.0	(3.4)	[1]	$ 136.9	[1]
Employer contributions	0.9	0.9
U.S. Qualified Plan Termination [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	$ 3.4
U.S. Qualified Plan Termination [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan Assets Used to Fund Settlement		320.0
Contributions to postretirement plans		$ 8.4

[1] 2021 includes income of $3.4 from a pricing adjustment associated with the termination and sale of the U.S. qualified pension plan. In 2020, the Company recorded a settlement charge of $136.9 related to the termination and sale of the U.S. qualified pension plan.