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Postretirement Benefit Plans - Additional Information (Detail) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) Participant shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions made to pension plans | $ 18.4 | $ 17.3 |  | $ 15.3
Shares of ITT Stock Held in Defined Contribution Plan | shares | 0.2 |  |  |
Active participants in numerous defined benefit pension plans | Participant | 2,200 |  |  |
Amendments(a) | $ 0.0 | 54.2 |  |
Defined Benefit Plan, Reduction to Postretirement Liability from Plan Amendment and Curtailment |  | 58.7 |  |
Accumulated benefit obligation | $ 415.4 | $ 408.3 |  |
Long-term annual rate of return for domestic pension plans | 8.00% | 8.00% |  | 8.00%
Increase to Benefit Obligation from Adoption of Revised Mortality Assumption |  | $ 19.0 |  |
Assumed rate of future decrease in per capita cost of health care for 2021 | 4.50% |  |  |
Effect of one percent increase on benefit obligation | $ 6.6 |  |  |
Effect of one percent increase on annual service and interest cost components | 0.2 |  |  |
Effect of one percent decrease on benefit obligation | 5.6 |  |  |
Effect of one percent decrease on annual service and interest cost components | 0.2 |  |  |
Contributions to postretirement plans | 18.6 | 12.6 |  | $ 11.9
Employer contributions | $ 18.6 | 12.6 |  |
Reduction to Investment Target Allocation for Fixed Income | 15.00% |  |  |
Expected Increase in NPPC due to lower expected return on assets | $ 2.0 |  |  |
Consolidated Hourly Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected Benefit Obligation | 35.00% |  |  |
Other Non Qualified Us Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected Benefit Obligation | 11.00% |  |  |
Pension Plan For Bargaining Unit Employees Seneca Falls [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected Benefit Obligation | 35.00% |  |  |
International Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected Benefit Obligation | 19.00% |  |  |
Amendments(a) | $ 0.0 | 0.0 |  |
Effect of curtailment / Special termination benefit | $ 0.1 | $ 0.4 |  | 0.0
Long-term annual rate of return for domestic pension plans | 4.80% | 4.70% |  |
Employer contributions | $ 3.8 | $ 3.5 |  |
Other Postretirement Benefit Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amendments(a) | 0.0 | 58.7 | [1] |
Effect of curtailment / Special termination benefit | $ (4.2) | $ 0.0 |  | 0.0
Long-term annual rate of return for domestic pension plans | 8.00% | 8.00% |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | $ 10.0 |  |  |
Employer contributions | 6.2 | $ 8.2 |  |
U.S. Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amendments(a) | 0.0 | (4.5) |  |
Effect of curtailment / Special termination benefit | $ 0.0 | $ 0.0 |  | 1.2
Long-term annual rate of return for domestic pension plans | 8.00% | 8.00% |  |
Employer contributions | $ 8.6 | $ 0.9 |  |
Pre-age 65 retirees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumed rate of future increase in per capita cost of health care for 2013 | 8.50% |  |  |
Post-age 65 retirees [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumed rate of future increase in per capita cost of health care for 2013 | 6.50% |  |  |
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Effect of curtailment / Special termination benefit | $ 0.1 | 0.4 |  | $ 1.2
Contributions to postretirement plans | 12.4 | $ 4.4 |  |
Discretionary Pension Contribution | 7.5 |  |  |
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year | $ 5.0 |  |  |
[1] | (a)During 2014, management approved changes to certain other employee-related defined benefit plans, reducing certain retiree medical benefits, resulting in a decrease to ITT's other employee-related defined benefit liability of $58.7.

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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