Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The Consolidated Financial Statements include all wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. The Company participates in two joint ventures, one of which is accounted for using the equity method, the other has been consolidated in accordance with the consolidation accounting guidance. An analysis is performed to determine which reporting entity, if any, has a controlling financial interest in a variable interest entity (“VIE”) with a primarily qualitative analysis. The qualitative analysis is based on identifying the party that has both the power to direct the activities that most significantly impact the VIE’s economic performance (the “power criterion”) and the obligation to absorb losses from or the right to receive benefits of the VIE that could potentially be significant to the VIE (the “losses/benefit criterion”). The party that meets both these criteria is deemed to have a controlling financial interest. The party with the controlling financial interest is considered to be the primary beneficiary and as a result is required to consolidate the VIE. The Company has a 50% interest in a joint venture in Hong Kong, established as Hubbell Asia Limited (“HAL”). The principal objective of HAL is to manage the operations of its wholly-owned manufacturing company in China. Under the accounting guidance, the Company is the primary beneficiary of HAL and as a result consolidates HAL. This determination is based on the fact that HAL’s sole business purpose is to manufacture product exclusively for the Company (the power criterion) and the Company is financially responsible for ensuring HAL maintains a fixed operating margin (the losses/benefit criterion). The consolidation of HAL is not material to the Company’s consolidated financial statements.
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts in the Consolidated Financial Statements and accompanying Notes to Consolidated Financial Statements. Actual results could differ from the estimates that are used.
Revenue Recognition	Revenue Recognition The Company recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed and determinable and collection is probable. Product is considered delivered to the customer once it has been shipped and title and risk of loss have been transferred. The majority of the Company’s revenue is recognized at the time of shipment. The Company recognizes less than one percent of total annual consolidated net revenue from post shipment obligations and service contracts, primarily within the Electrical segment. Revenue is recognized under these contracts when the service is completed and all conditions of sale have been met. In addition, within the Electrical segment, certain businesses sell large and complex equipment which requires construction and assembly and occasionally has long lead times. It is customary in these businesses to require a portion of the selling price to be paid in advance of construction. These payments are treated as deferred revenue and are classified in Other accrued liabilities in the Consolidated Balance Sheet. Once the equipment is shipped to the customer and meets the revenue recognition criteria, the deferred revenue is recognized in the Consolidated Statement of Income. Further, certain of our businesses provide for sales discounts and allowances based on sales volumes, specific programs and customer deductions, as is customary in the electrical products industry. These items primarily relate to sales volume incentives, special pricing allowances, and returned goods. Sales volume incentives represent rebates with specific sales volume targets for specific customers. Certain distributors qualify for price rebates by subsequently reselling the Company’s products into select channels of end users. Following a distributor’s sale of an eligible product, the distributor submits a claim for a price rebate. Customers also have a right to return goods under certain circumstances which are reasonably estimable by affected businesses. Customer returns have historically ranged from 1%-2% of gross sales. These arrangements require us to estimate at the time of sale the amounts that should not be recorded as revenue as these amounts are not expected to be collected from customers. The Company principally relies on historical experience, specific customer agreements and anticipated future trends to estimate these amounts at the time of shipment.
Shipping and Handling Fees and Costs	Shipping and Handling Fees and Costs The Company records shipping and handling costs as part of Cost of goods sold in the Consolidated Statement of Income. Any amounts billed to customers for reimbursement of shipping and handling are included in Net sales in the Consolidated Statement of Income.
Foreign Currency Translation	Foreign Currency Translation The assets and liabilities of international subsidiaries are translated to U.S. dollars at exchange rates in effect at the end of the year, and income and expense items are translated at average exchange rates in effect during the year. The effects of exchange rate fluctuations on the translated amounts of foreign currency assets and liabilities are included as translation adjustments in Accumulated other comprehensive loss within Hubbell shareholders’ equity. Gains and losses from foreign currency transactions are included in results of operations.
Cash and Cash Equivalents	Cash and Cash Equivalents The carrying value of cash equivalents approximates fair value. Cash equivalents consist of highly liquid investments with original maturities to the Company of three months or less.
Investments	Investments Investments in debt and equity securities are classified by individual security as available-for-sale, held-to-maturity or trading securities. Our available-for-sale securities, consisting of municipal bonds and the redeemable preferred stock of a privately held company, are carried on the balance sheet at fair value with current period adjustments to carrying value recorded in Accumulated other comprehensive loss within Hubbell shareholders’ equity, net of tax. Realized gains and losses are recorded in income in the period of sale. The Company’s trading securities are carried on the balance sheet at fair value and consist primarily of debt and equity mutual funds. Gains and losses associated with these trading securities are reflected in the results of operations. The Company did not have any investments classified as held-to-maturity as of December 31, 2017 and 2016.
Accounts Receivable and Allowances	Accounts Receivable and Allowances Trade accounts receivable are recorded at the invoiced amount and generally do not bear interest. The allowance for doubtful accounts is based on an estimated amount of probable credit losses in existing accounts receivable. The allowance is calculated based upon a combination of historical write-off experience, fixed percentages applied to aging categories and specific identification based upon a review of past due balances and problem accounts. Account balances are charged off against the allowance when it is determined that internal collection efforts should no longer be pursued. The Company also maintains a reserve for credit memos, cash discounts and product returns which are principally calculated based upon historical experience, specific customer agreements, as well as anticipated future trends.
Inventories	Inventories Inventories are stated at the lower of cost or market value. Approximately 71% of total net inventory value is determined utilizing the last-in, first-out (LIFO) method of inventory accounting. The cost of foreign inventories and certain domestic inventories is determined utilizing average cost or first-in, first-out (FIFO) methods of inventory accounting. Reserves for excess and obsolete inventory are provided based on current assessments about future demand compared to on-hand quantities.
Property, Plant and Equipment	Property, Plant, and Equipment Property, plant, and equipment values are stated at cost less accumulated depreciation. Maintenance and repair expenditures that do not significantly increase the life of an asset are charged to expense when incurred. Property, plant, and equipment placed in service prior to January 1, 1999 are depreciated over their estimated useful lives, principally using accelerated methods. Assets placed in service subsequent to January 1, 1999 are depreciated over their estimated useful lives, using straight-line methods. Leasehold improvements are amortized over the shorter of their economic lives or the lease term. Gains and losses arising on the disposal of property, plant and equipment are included in Operating income in the Consolidated Statement of Income.
Capitalized Computer Software Costs	Capitalized Computer Software Costs Capitalized computer software costs, net of amortization, were $15.7 million and $15.6 million at December 31, 2017 and 2016, respectively. This balance is reflected in Other long-term assets in the Consolidated Balance Sheet. Capitalized computer software is for internal use and costs primarily consist of purchased materials and services. Software is amortized on a straight-line basis over appropriate periods, generally five years. The Company recorded amortization expense of $5.6 million in 2017, $5.2 million in 2016 and $4.6 million in 2015 relating to capitalized computer software.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents purchase price in excess of fair values of the underlying net assets of acquired companies. Indefinite-lived intangible assets and goodwill are subject to annual impairment testing using the specific guidance and criteria described in the accounting guidance. The Company performs its goodwill impairment testing as of April 1st of each year, unless circumstances dictate the need for more frequent assessments. The accounting guidance provides entities an option of performing a qualitative assessment (a "step-zero" test) before performing a quantitative analysis. If the entity determines, on the basis of certain qualitative factors, that it is more-likely-than-not that the goodwill is not impaired, the entity would not need to proceed to the two step goodwill impairment testing process (quantitative analysis) as prescribed in the guidance. The Company applied the "step-zero" test to two of its reporting units. Based on that qualitative assessment, the Company concluded it was more-likely-than-not that the fair value of these reporting units substantially exceeded their carrying value and therefore, further quantitative analysis was not required. For each of the Company's other reporting units the Company has elected to utilize the two step goodwill impairment testing process as permitted in the accounting guidance. Step 1 compares the fair value of the Company’s reporting units to their carrying values. If the fair value of the reporting unit exceeds its carrying value, no further analysis is necessary. If the carrying value of the reporting unit exceeds its fair value, Step 2 must be completed to determine the amount of impairment. Goodwill impairment testing requires judgment, including the identification of reporting units, assigning assets and liabilities to reporting units and determining the fair value of each reporting unit. Significant judgments required to estimate the fair value of reporting units include estimating future cash flows, determining appropriate discount rates and other assumptions. The Company uses internal discounted cash flow estimates to determine fair value. These cash flow estimates are derived from historical experience and future long-term business plans and the application of an appropriate discount rate. Changes in these estimates and assumptions could materially affect the determination of fair value and/or goodwill impairment for each reporting unit. The Company’s estimated aggregate fair value of its reporting units are reasonable when compared to the Company’s market capitalization on the valuation date. As of April 1, 2017, our impairment testing resulted in implied fair values for each reporting unit that exceeded the reporting unit’s carrying value, including goodwill. The Company did not have any reporting units at risk of failing Step 1 of the impairment test as the excess of the implied fair value significantly exceeded the carrying value of the reporting units. Additionally, the Company did not have any reporting units with zero or negative carrying amounts. The Company has not recorded any goodwill impairments since the initial adoption of the accounting guidance in 2002. The Company’s intangible assets consist primarily of customer relationships, tradenames and patents. Intangible assets with definite lives are amortized over periods generally ranging from 5-30 years. The Company amortizes intangible assets with definite lives using either an accelerated method that reflects the pattern in which economic benefits of the intangible assets are consumed and results in higher amortization in the earlier years of the assets useful life, or using a straight line method. Approximately 60% of the gross value of definite-lived intangible assets follow an accelerated amortization method. These definite lived intangibles are tested for impairment whenever events or circumstances indicate that the carrying amount of an asset (asset group) may not be recoverable. An impairment loss is recognized when the carrying amount of an asset exceeds the estimated undiscounted cash flows used in determining the fair value of the asset. The Company did not record any material impairments related to its definite lived intangible assets in 2017, 2016 or 2015. The Company also has some tradenames that are considered to be indefinite-lived intangible assets. These indefinite-lived intangible assets are not amortized and are tested for impairment annually, unless circumstances dictate the need for more frequent assessment. The accounting guidance related to testing indefinite-lived intangible assets for impairment provides entities an option of performing a qualitative assessment before calculating the fair value of the asset. If the entity determines, on the basis of certain qualitative factors, that it is more-likely-than-not that the asset is not impaired, the entity would not need to calculate the fair value of the asset. The Company performed the qualitative assessment which resulted in no impairment in 2017, 2016 and 2015.
Other Long-Lived Assets	Other Long-Lived Assets The Company reviews depreciable long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be fully recoverable. If such a change in circumstances occurs, the related estimated future undiscounted cash flows expected to result from the use of the asset group and its eventual disposition is compared to the carrying amount. If the sum of the expected cash flows is less than the carrying amount, an impairment charge is recorded. The impairment charge is measured as the amount by which the carrying amount exceeds the fair value of the asset. The fair value of impaired assets is determined using expected cash flow estimates, quoted market prices when available and appraisals as appropriate. The Company did not record any material impairment charges in 2017, 2016 or 2015.
Accrued Insurance	Accrued Insurance The Company retains a significant portion of the risks associated with workers’ compensation, medical, automobile and general liability insurance. The Company estimates self-insurance liabilities using a number of factors, including historical claims experience, demographic factors, and other actuarial assumptions. The accrued liabilities associated with these programs are based on the Company’s estimate of the ultimate costs to settle known claims as well as claims incurred but not reported as of the balance sheet date. The Company periodically reviews the assumptions with a third party actuary to determine the adequacy of these self-insurance reserves.
Income Taxes	Income Taxes The Company operates within multiple taxing jurisdictions and is subject to audit in these jurisdictions. The IRS and other tax authorities routinely examine the Company’s tax returns. These audits can involve complex issues which may require an extended period of time to resolve. The Company makes adequate provisions for best estimates of exposures on previously filed tax returns. Deferred income taxes are recognized for the tax consequence of differences between financial statement carrying amounts and the tax basis of assets and liabilities by applying the currently enacted statutory tax rates in accordance with the accounting guidance for income taxes. The effect of a change in statutory tax rates is recognized in the period that includes the enactment date. Additionally, deferred tax assets are required to be reduced by a valuation allowance if it is more-likely-than-not that some portion or all of the deferred tax asset will not be realized. The Company uses factors to assess the likelihood of realization of deferred tax assets such as the forecast of future taxable income and available tax planning strategies that could be implemented to realize the deferred tax assets. In addition, the accounting guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of the tax position taken or expected to be taken in a tax return. For any amount of benefit to be recognized, it must be determined that it is more-likely-than-not that a tax position will be sustained upon examination by taxing authorities based on the technical merits of the position. The amount of benefit to be recognized is based on the Company’s assertion of the most likely outcome resulting from an examination, including resolution of any related appeals or litigation processes. Companies are required to reflect only those tax positions that are more-likely-than-not to be sustained. We have accounted for the estimated impact of the TCJA based on the guidance outlined in SAB 118. The accounting for the income tax effects of the TCJA may include provisional amounts during the one-year measurement period from the date of enactment. Accordingly, the Company has included in the current period financial statements a provisional amount with respect to the deemed repatriation provisions of the TCJA, the revaluation of U.S. deferred taxes and the U.S. and foreign tax costs associated with anticipated remittances related to certain of our outside basis differences. We have also included provisional amounts with respect to those states with current conformity to the Internal Revenue Code all of which will be subject to change during the measurement period. The TCJA also contains a new tax law that may subject the Company to a tax on Global Intangible Low-Taxed Income (GILTI), beginning in 2018. GILTI is a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The FASB has provided that Companies subject to GILTI have the option to account for the GILTI tax as a period cost if and when incurred, or to recognize deferred taxes for temporary differences, including outside basis differences, expected to reverse as GILTI. We have elected to account for GILTI as a period cost. See Note 12 — Income Taxes for additional information.
Research and Development	Research and Development Research and development expenditures represent costs to discover and/or apply new knowledge in developing a new product, process, or in bringing about a significant improvement to an existing product or process. Research and development expenses are recorded as a component of Cost of goods sold. Expenses for research and development were approximately 3% of Cost of goods sold in 2017 and 2% in 2016 and 2015.
Retirement Benefits	Retirement Benefits The Company maintains various defined benefit pension plans for some of its U.S. and foreign employees. The accounting guidance for retirement benefits requires the Company to recognize the funded status of its defined benefit pension and postretirement plans as an asset or liability in the Consolidated Balance Sheet. Gains or losses, prior service costs or credits, and transition assets or obligations that have not yet been included in net periodic benefit cost as of the end of the year are recognized as components of Accumulated other comprehensive loss, net of tax, within Hubbell shareholders’ equity. The Company’s policy is to fund pension costs within the ranges prescribed by applicable regulations. In addition to providing defined benefit pension benefits, the Company provides health care and life insurance benefits for some of its active and retired employees. The Company’s policy is to fund these benefits through insurance premiums or as actual expenditures are made. See also Note 10 — Retirement Benefits.
Earnings Per Share	Earnings Per Share Restricted stock granted by the Company is considered a participating security since it contains a non-forfeitable right to dividends. As a result, the earnings per share accounting guidance requires the Company to use the two-class method for calculating earnings per share. The two-class method is an earnings allocation formula that determines earnings per share for common stock and participating securities. Basic earnings per share is calculated as net income available to common shareholders divided by the weighted average number of shares of common stock outstanding. Earnings per diluted share is calculated as net income available to common shareholders divided by the weighted average number of shares outstanding of common stock plus the incremental shares outstanding assuming the exercise of dilutive stock options, stock appreciation rights and performance shares. See also Note 17 — Earnings Per Share.
Stock-Based Compensation	Stock-Based Compensation The Company recognizes the grant-date fair value of all stock-based awards on a straight-line basis over their respective requisite service periods (generally equal to an award’s vesting period). A stock-based award is considered vested for expense attribution purposes when the retention of the award is no longer contingent on providing subsequent service. Accordingly, the Company recognizes compensation cost immediately for awards granted to retirement-eligible individuals or over the period from the grant date to the date retirement eligibility is achieved, if less than the stated vesting period. The expense is recorded in Cost of goods sold and S&A expense in the Consolidated Statement of Income based on the recipients’ respective functions within the organization. The Company records deferred tax assets for awards that will result in deductions on its tax returns, based upon the amount of compensation cost recognized and the statutory tax rate in the jurisdiction in which it will receive a deduction. The Company adopted ASU 2016-09 relating to the accounting for share-based payments on January 1, 2017. The standard requires that differences between the deferred tax assets recognized for financial reporting purposes and the actual tax deduction reported on the Company's tax return be recoded as a component of income tax expense. Prior to the adoption of the standard, differences between the deferred tax assets recognized for financial reporting purposes and the actual tax deduction reported in the Company’s tax return were recognized in Additional paid-in capital to the extent that previously recognized credits to paid-in capital were still available. See also Note 16 — Stock-Based Compensation.
Derivatives	Derivatives In order to limit financial risk in the management of its assets, liabilities and debt, the Company may use derivative financial instruments such as foreign currency hedges, interest rate hedges and interest rate swaps. All derivative financial instruments are matched with an existing Company asset, liability or proposed transaction. The Company does not speculate or use leverage when trading a derivative product. Market value gains or losses on the derivative financial instrument are recognized in income when the effects of the related price changes of the underlying asset or liability are recognized in income. See Note 13 — Financial Instruments and Fair Value Measurement for more information regarding our derivative instruments.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In response to the TCJA, which was signed into law on December 22, 2017, the Securities and Exchange Commission’s Office of the Chief Accountant published SAB 118. SAB 118 addresses the requirements to account for the impact of a change in tax law or tax rates in the period of enactment. Specifically, SAB 118 provides guidance for issuers that are not able to complete the accounting for the income tax effects of the TCJA by the time financial statements are issued for the reporting period that includes the enactment date (“enactment period financials”). Pursuant to SAB 118, if the accounting for specific income tax effects of the TCJA is incomplete at the time the financial statements are issued, a company should provide a provisional amount for specific income tax effects for which a reasonable estimate can be determined. For any specific income tax effects of the TCJA for which a reasonable estimate cannot be determined because additional information, data, analysis or preparation is required, a company should not report a provisional amount but continue to apply the rules in effect immediately prior to enactment. For income tax effects for which a company was not able to determine a reasonable estimate in the enactment period financials, a provisional amount must be recorded in the first reporting period in which a reasonable estimate can be determined. Under SAB 118, the measurement period for accounting for the 2017 Act begins in the period of enactment and ends when an entity has obtained, prepared and analyzed the information necessary to complete the accounting requirements under ASC 740 (the “measurement period”), but in no event can the measurement period extend beyond one year from the TCJA’s enactment date. Any provisional amount or adjustment to a provisional amount included in a company’s financial statements during the measurement period should be included in income from continuing operations as an adjustment to tax expense or benefit in the reporting period the amounts are determined. In March 2017, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update (ASU 2017-07) on the presentation of net periodic pension cost and net periodic post-retirement benefit cost. The new guidance requires the service cost component of net periodic pension and post-retirement benefit costs to be reported in the same income statement line item as other employee compensation costs, and the other non-service components to be reported outside of operating income. This new guidance is effective for fiscal years beginning after December 15, 2017 and must be applied on a retrospective basis. Upon adoption, the Company expects 2016 Operating income to increase by $12.0 million and 2017 Operating income to increase by $15.0 million, due to the removal of the non-service components of net periodic pension and post-retirement benefit costs. The Company expects a corresponding increase to Other expense, net, resulting in zero impact to net income in both periods. In August 2016, the FASB issued an Accounting Standards Update (ASU 2016-15) to provide additional guidance and reduce diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The Company adopted the standard during the third quarter of 2017, and the comparable periods within the Consolidated Statements of Cash Flows have been recast to reflect adoption. The adoption did not have a material impact on the Company's financial statements. In March 2016, the FASB issued an Accounting Standards Update (ASU 2016-09) relating to the accounting for share-based payments. The new guidance requires all income tax effects of share-based awards to be recognized in the income statement when the awards vest or are settled, and allows companies an additional election in the method to estimate forfeitures of share-based payments. The new guidance also requires excess tax benefits to be classified as an operating activity in the statement of cash flows, and cash paid to a tax authority when shares are withheld to satisfy the employer's statutory income tax withholdings be classified as a financing activity. The Company adopted the standard on January 1, 2017. The Company elected to adopt all provisions impacting the Consolidated Statements of Cash Flows retrospectively; as such, the comparable periods within the Consolidated Statements of Cash Flows have been recast to reflect the adoption. The income statement provisions of the new guidance have been adopted prospectively. There is no change to the Company's accounting policy with respect to estimation of forfeitures. The adoption did not have a material impact on the Company's financial statements. In February 2016, the FASB issued an Accounting Standards Update (ASU 2016-02) related to the accounting and financial statement presentation for leases. This new guidance will require a lessee to recognize a right-to-use asset and a lease liability for both financing and operating leases, with a policy election permitting an exception to this guidance for leases with a term of twelve months or less. For financing leases, the lessee will recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee will recognize a straight-line lease expense. This guidance is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The new standard must be adopted using a modified retrospective transition at the beginning of the earliest comparative period presented. The Company expects to recognize approximately $100 million of right-of-use assets and corresponding lease liabilities on the balance sheet upon adoption. The Company does not expect the adoption will have a material impact on results of operations. In May 2014, the FASB issued an Accounting Standards Update (ASU 2014-09) related to new revenue recognition guidance that supersedes the existing revenue recognition guidance and most industry-specific guidance applicable to revenue recognition. According to the new guidance, an entity will apply a principles-based five step model to recognize revenue upon the transfer of promised goods or services to customers and in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. Subsequently, the FASB has issued amendments to certain aspects of the guidance including the effective date. The Company will adopt the guidance in the first quarter of 2018 using the modified-retrospective method. Based on the reviews and assessments performed to date, the Company expects the pattern of revenue recognition for substantially all of its businesses to be unchanged, and that upon adoption revenue will generally continue to be recognized at a single point in time when control is transferred to the customer. The Company anticipates an immaterial impact to retained earnings upon adoption, as well as an immaterial balance sheet impact related to the classification of amounts associated with sales returns reserves.