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Postretirement Benefit Plans - Additional Information (Detail) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Participant shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contributions to defined contribution plans | $ 10.6 | $ 17.6 | $ 17.1
Shares of ITT Stock Held in Defined Contribution Plan | shares | 0.1 |  |
Active participants in numerous defined benefit pension plans | Participant | 900 |  |
Settlement charges | $ 137.0 | 0.0 | 1.7
Accumulated benefit obligation | $ 121.6 | 406.3 |
Assumed rate of future decrease in per capita cost of health care for 2028 | 4.50% |  |
Contributions to postretirement plans | $ 18.0 | 22.9 | 11.2
Employer contributions | 18.0 | 22.9 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges | 137.0 | 0.0 | 1.7
Contributions to postretirement plans | 13.4 | 12.9 |
Discretionary Pension Contribution |  | 9.0 |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | 6.0 |  |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 4.6 | 10.0 |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | $ 9.0 |  |
International Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation | 88.00% |  |
International Plan [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges | $ 0.1 | 0.0 | $ 0.0
Employer contributions | 4.1 | 3.0 |
United States | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement charges | 136.9 | 0.0 |
Employer contributions | $ 9.3 | $ 9.9 |
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 | 6.50% |  |
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 | 5.80% |  |
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 |  |

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