Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Participant	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Contributions made to pension plans	$ 17.3	$ 15.3	$ 13.5
Active participants in numerous defined benefit pension plans	2,400
Amendments	(54.2)	(18.9)
Defined Benefit Plan, Reduction to Postretirement Liability from Plan Amendment and Curtailment		23.3
Effect of curtailment / Special termination benefit		1.2
Accumulated benefit obligation	408.3	363.0
Long-term annual rate of return for domestic pension plans	8.00%	8.00%	8.00%
Assumed rate of future decrease in per capita cost of health care for 2021	4.50%
Effect of one percent increase on benefit obligation	5.5
Effect of one percent increase on annual service and interest cost components	0.5
Effect of one percent decrease on benefit obligation	4.7
Effect of one percent decrease on annual service and interest cost components	0.4
Foreign government plan assets	1.0itt_ForeignGovernmentPlanAssets
Contributions to postretirement plans	12.6us-gaap_PensionContributions	11.9us-gaap_PensionContributions	71.0us-gaap_PensionContributions
Employer contributions	12.6	11.9
Consolidated Hourly Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	38.00%
Other Non Qualified Us Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	4.00%
Defined Contribution Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution percentage of base pay prior to enhancement	3.50%
Period of distribution	5 years
Stock fund held approximately	0.2
Defined Contribution Plans [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution percentage of base pay post enhancement	7.00%
Percentage of transition credit	5.00%
Defined Contribution Plans [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution percentage of base pay post enhancement	6.00%
Pension Plan For Bargaining Unit Employees Seneca Falls [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	37.00%
International Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation	21.00%
Amendments	0	0
Effect of curtailment / Special termination benefit	0.4	0	0
Long-term annual rate of return for domestic pension plans	4.70%	4.70%
Employer contributions	3.5	2.8
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amendments	(58.7)	(19.0)
Long-term annual rate of return for domestic pension plans	8.00%	8.00%
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year	11.0
Employer contributions	8.2	8.2
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amendments	4.5	0.1
Effect of curtailment / Special termination benefit	0	1.2	0
Long-term annual rate of return for domestic pension plans	8.00%	8.00%
Employer contributions	0.9	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	8.00%
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	6.30%
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of curtailment / Special termination benefit	0.4	1.2	0
Contributions to postretirement plans	4.4	3.7
Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year	$ 5.0

Active participants in numerous defined benefit pension plans.

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Company Contribution Percentage Of Base Pay After Distribution Date

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Company Contribution Percentage Of Base Pay Before Distribution Date

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Defined Benefit Plan, Expected Employer Contributions Next Fiscal Year

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Defined Benefit Plan, Reduction to Postretirement Liability from Plan Amendment and Curtailment

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Foreign government plan assets.

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Percentage Of Projected Benefit Obligation

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Percentage of transition credits.

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Period Of Enhanced Company Contribution Funding

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Stock fund held approximately.

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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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

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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

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

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-Subparagraph (k)(3)

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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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.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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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.

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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

-Topic 715

-SubTopic 60

-Glossary Plan Amendment

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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-Glossary Plan Curtailment

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- Definition

The ultimate trend rate for health care costs.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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-Publisher FASB

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