Postretirement Benefit Plans - Summary of Funded Status of Postretirement Benefit Plans and Presentation of Such Balances within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 283.4	$ 278.0	$ 257.0
Projected benefit obligation	546.1	532.6	600.0
Funded status	(262.7)	(254.6)
Amounts reported within:
Non-current assets	0	1.9
Accrued liabilities	(13.0)	(13.2)
Non-current liabilities	(249.7)	(243.3)
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	273.9	268.8
Projected benefit obligation	411.6	366.0
Funded status	(137.7)	(97.2)
Amounts reported within:
Non-current assets	0	1.9
Accrued liabilities	(4.4)	(4.8)
Non-current liabilities	(133.3)	(94.3)
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.5	9.2	7.9
Projected benefit obligation	134.5	166.6	213.0
Funded status	(125.0)	(157.4)
Amounts reported within:
Non-current assets	0	0
Accrued liabilities	(8.6)	(8.4)
Non-current liabilities	$ (116.4)	$ (149.0)

Postretirement Benefit Plans - Summary of Funded Status of Postretirement Benefit Plans and Presentation of Such Balances within Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Defined Benefit Plan Disclosure [Line Items]

Fair value of plan assets

$ 283.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

$ 278.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

$ 257.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets

Projected benefit obligation

546.1us-gaap_DefinedBenefitPlanBenefitObligation

532.6us-gaap_DefinedBenefitPlanBenefitObligation

600.0us-gaap_DefinedBenefitPlanBenefitObligation

Funded status

(262.7)us-gaap_DefinedBenefitPlanFundedStatusOfPlan

(254.6)us-gaap_DefinedBenefitPlanFundedStatusOfPlan

Amounts reported within:

Non-current assets

0itt_PensionandOtherPostretirementDefinedBenefitPlansAssetsNoncurrent

1.9itt_PensionandOtherPostretirementDefinedBenefitPlansAssetsNoncurrent

Accrued liabilities

(13.0)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

(13.2)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

Non-current liabilities

(249.7)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

(243.3)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

Pension [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair value of plan assets

273.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Projected benefit obligation

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366.0us-gaap_DefinedBenefitPlanBenefitObligation
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Funded status

(137.7)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
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(97.2)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Amounts reported within:

Non-current assets

0itt_PensionandOtherPostretirementDefinedBenefitPlansAssetsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember

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Accrued liabilities

(4.4)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
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= us-gaap_PensionPlansDefinedBenefitMember

(4.8)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember

Non-current liabilities

(133.3)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember

(94.3)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember

Other Postretirement Benefit Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Fair value of plan assets

9.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

9.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

7.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

Projected benefit obligation

134.5us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

166.6us-gaap_DefinedBenefitPlanBenefitObligation
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

213.0us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

Funded status

(125.0)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

(157.4)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

Amounts reported within:

Non-current assets

0itt_PensionandOtherPostretirementDefinedBenefitPlansAssetsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

Accrued liabilities

(8.6)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

(8.4)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

Non-current liabilities

$ (116.4)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember

$ (149.0)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
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- Definition

Pension and Other Postretirement Defined Benefit Plans, Assets, Noncurrent

+ References

No definition available.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ 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)

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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-Subparagraph (c)

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- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

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-Name Accounting Standards Codification

-Topic 715

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- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

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-Section S99

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-Subparagraph (SX 210.5-02.24)

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