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Postretirement Benefit Plans - Additional Information (Details) shares in Millions, $ in Millions | 12 Months Ended
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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.

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