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Postretirement Benefit Plans - Additional Information (Detail) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) Participant shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company contributions to defined contribution plans | $ 14.5 |  | $ 10.6 |  | $ 17.6
Shares of ITT Stock Held in Defined Contribution Plan | shares | 0.1 |  |  |  |
Active participants in numerous defined benefit pension plans | Participant | 950 |  |  |  |
Pension settlement charges | $ 0.0 |  | 137.0 |  | 0.0
Contributions to postretirement plans | 10.5 |  | 18.0 |  | 22.9
Accumulated benefit obligation | $ 105.5 |  | 121.6 |  |
Assumed rate of future decrease in per capita cost of health care for 2028 | 4.50% |  |  |  |
Employer contributions | $ 10.5 |  | 18.0 |  |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension settlement charges | (3.4) | [1] | 137.0 | [1] | 0.0
Contributions to postretirement plans | 4.3 |  | 13.4 |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | 6.0 |  |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions | 6.2 |  | 4.6 |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | $ 9.0 |  |  |  |
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 | 6.20% |  |  |  |
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 | 5.60% |  |  |  |
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] |  |  |  |  |
Pension settlement charges | $ 0.0 |  | 0.1 |  | $ 0.0
Employer contributions | 3.4 |  | 4.1 |  |
U.S. Qualified Plan Termination [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement | 3.4 |  |  |  |
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 |  | $ 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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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