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Postretirement Benefit Plans - Additional Information (Detail) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) Participant shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contributions to defined contribution plans | $ 17.6 | $ 17.1 | $ 16.7
Shares of ITT Stock Held in Defined Contribution Plan | shares | 0.2 |  |
Active participants in numerous defined benefit pension plans | Participant | 1,800 |  |
Accumulated benefit obligation | $ 406.3 | 379.1 |
Assumed rate of future decrease in per capita cost of health care for 2027 | 4.50% |  |
Contributions to postretirement plans | $ 22.9 | 11.2 | 45.0
Employer contributions | 22.9 | 11.2 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment or settlement charges | 0.0 | 1.7 | 3.7
Contributions to postretirement plans | 12.9 | 4.3 |
Discretionary Pension Contribution | 9.0 |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | 5.0 |  |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | 10.0 |  |
Employer contributions | $ 10.0 | 6.9 |
International Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation | 24.00% |  |
International Plan [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment or settlement charges | $ 0.0 | 0.0 | $ 0.0
Employer contributions | $ 3.0 | $ 3.4 |
Pre Age Sixty Five [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assumed rate of future increase in per capita cost of health care for 2018 | 6.80% |  |
Post-age 65 retirees [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assumed rate of future increase in per capita cost of health care for 2018 | 6.00% |  |
Other Non Qualified Us Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation | 76.00% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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