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Postretirement Benefit Plans - Additional Information (Details) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) Participant shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assumed rate of future decrease in per capita cost of health care for 2031 | 4.50% |  |
Shares of ITT Stock Held in Defined Contribution Plan | shares | 0.1 |  |
Company contributions to defined contribution plans | $ 17.3 | $ 16.5 | $ 14.5
Active participants in numerous defined benefit pension plans | Participant | 970 |  |
Accumulated benefit obligation | $ 82.5 | 77.5 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | 6.0 |  |
Contributions to postretirement plans | 4.5 | $ 3.9 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | $ 6.0 |  |
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 | 7.30% |  |
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 | 6.30% |  |
International Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation | 87.00% |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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