New Accounting Pronouncements (Policies)	6 Months Ended
New Accounting Pronouncements (Policies)	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Basis of Presentation	The condensed consolidated financial statements include the accounts of Park-Ohio Holdings Corp. and its subsidiaries (collectively, “we”, “our” or the “Company”). All intercompany accounts and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three- and six-month periods ended June 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. The balance sheet at December 31, 2016 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.
Use of Estimates	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Accounting Pronouncements Adopted and Not Yet Adopted	Accounting Pronouncements Adopted In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The ASU simplifies several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification of related amounts within the statement of cash flows. The Company adopted this ASU effective January 1, 2017. ASU 2016-09 requires prospective recognition of excess tax benefits and deficiencies resulting from share-based compensation awards vesting and exercises be recognized as a discrete income tax adjustment in the income statement. Previously, these amounts were recognized in Additional paid-in capital. In the six months ended June 30, 2017, the Company recognized income tax expense of $0.3 million for excess tax deficiencies upon vesting of awards. In addition, ASU 2016-09 requires excess tax benefits and shortfalls to be prospectively excluded from the assumed future proceeds in the calculation of diluted shares, resulting in an insignificant increase in diluted weighted average shares outstanding for the six months ended June 30, 2017 and an immaterial impact on earnings per share. ASU 2016-09 also requires that excess tax benefits from share-based compensation awards be reported as operating activities in the Condensed Consolidated Statements of Cash Flows. Previously, this activity was included in financing activities on the Condensed Consolidated Statements of Cash Flows. The Company has elected to apply this change on a prospective basis. This change has an immaterial impact on our Condensed Consolidated Statements of Cash Flows. Also, we elected to continue to estimate forfeitures rather than account for them as they occur. In January 2017, the FASB issued ASU 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill impairment." The amendments in the ASU simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. The ASU is effective for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company early adopted this guidance for any impairment test performed after January 1, 2017. Recent Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” which was the result of a joint project by the FASB and International Accounting Standards Board to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. generally accepted accounting principles and International Financial Reporting Standards. The ASU is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The ASU will require either retrospective application to each prior reporting period presented or modified retrospective application with the cumulative effect of initially applying the standard recognized at the date of adoption. The Company is in the process of analyzing the impact of ASU 2014-09, and the related ASUs, across all its businesses. This includes performing contract reviews and reviewing current accounting policies and practices to identify potential differences that would result from applying the requirements under the new standard. The Company expects to adopt the new standard using the modified retrospective approach, under which the cumulative effect of initially applying the new guidance is recognized as an adjustment to the opening balance of retained earnings upon adoption effective January 1, 2018. We are still evaluating the impact and an estimation of the impact cannot be made at this time. In addition, the standard requires new substantial disclosures and we continue to evaluate these requirements. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." The amendments in the ASU address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. The FASB also is addressing measurement of credit losses on financial assets in a separate project. The ASU is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is not permitted. The new guidance will be applied prospectively. The Company is currently evaluating the impact of adopting this guidance. In February 2016, the FASB issued ASU 2016-02 “Leases (Topic 842).” The ASU establishes a comprehensive new lease accounting model. The new standard: (a) clarifies the definition of a lease; (b) requires a dual approach to lease classification similar to current lease classifications; and (c) causes lessees to recognize leases on the balance sheet as a lease liability with a corresponding right-of-use asset for leases with a lease term of more than twelve months. The ASU is effective for interim and annual periods beginning after December 15, 2018. Early adoption is permitted. The new standard requires a modified retrospective transition for capital or operating leases existing at or entered into after the beginning of the earliest comparative period presented in the financial statements, but it does not require transition accounting for leases that expire prior to the date of initial application. The Company is currently evaluating the impact of adopting this guidance. In March 2017, the FASB issued ASU 2017-07, “Compensation - Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” The ASU requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The Company is planning to adopt this standard in the first quarter of 2018. The Company is currently evaluating the impact of adopting this guidance. No other recently issued ASUs are expected to have a material impact on our results of operations, financial condition or liquidity.
Segments	Our operating segments are defined as components of the enterprise for which separate financial information is available and evaluated on a regular basis by our chief operating decision maker to allocate resources and assess performance. For purposes of measuring business segment performance, the Company utilizes segment operating income, which is defined as revenues less expenses identifiable to the product lines within each segment. The Company does not allocate items that are non-operating; unusual in nature; or are corporate costs, which include but are not limited to executive and share-based compensation and corporate office costs. Segment operating income reconciles to consolidated income before income taxes by deducting corporate costs, certain non-cash items and interest expense.
Accrued Warranty Costs	The Company estimates warranty claims on products sold that may be incurred based on current and historical data. Actual warranty expense could differ from the estimates made by the Company based on product performance.
Income Taxes	The Company’s tax provision for interim periods is determined using an estimate of its annual effective income tax rate, adjusted for discrete items, if any, in each period. Each quarter, the Company updates its estimated annual effective income tax rate, and if the estimated income tax rate changes, a cumulative adjustment is made.
Commitments and Contingencies	The Company is subject to various pending and threatened legal proceedings arising in the ordinary course of business. The Company records a liability for loss contingencies in the consolidated financial statements when a loss is known or considered probable and the amount can be reasonably estimated. Our provisions are based on historical experience, current information and legal advice, and they may be adjusted in the future based on new developments. Estimating probable losses requires the analysis of multiple forecasted factors that often depend on judgments and potential actions by third parties. Although it is not possible to predict with certainty the ultimate outcome or cost of these matters, the Company believes they will not have a material adverse effect on our consolidated financial statements.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.