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Significant Accounting Policies (Policies)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Note 1 - Significant Accounting Policies
Principles of Consolidation:
The consolidated financial statements include the accounts and operations of the Company in which a controlling interest is maintained. Investments in affiliated companies where the Company exercises significant influence, but does not control, and the activities of which it is not the primary beneficiary, are accounted for using the equity method. All intercompany accounts and transactions are eliminated upon consolidation.

Revenue Recognition:
The Company recognizes revenue when title passes to the customer. This occurs at the shipping point except for goods sold by certain foreign entities and certain exported goods, where title passes when the goods reach their destination. Selling prices are fixed based on purchase orders or contractual arrangements. Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold in the Consolidated Statements of Income.

The Company recognizes a portion of its revenues on the percentage-of-completion method measured on the cost-to-cost basis. In 2017, 2016 and 2015, the Company recognized $83 million, $68 million, and $66 million, respectively, in net sales under the percentage-of-completion method. As of December 31, 2017 and 2016, net accounts receivable included costs in excess of billings of $67.3 million and $63.5 million, respectively, related to these net sales.

Cash Equivalents:
The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Restricted Cash:
Cash of $3.8 million and $2.7 million at December 31, 2017 and 2016, respectively, was restricted. The increase was primarily due to cash restricted for bank guarantees of $0.5 million and for unclaimed dividends by foreign subsidiaries to minority shareholders of $0.6 million.

Allowance for Doubtful Accounts:
The Company maintains an allowance for doubtful accounts, which represents an estimate of the losses expected from the accounts receivable portfolio, to reduce accounts receivable to their net realizable value. The allowance is based upon historical trends in collections and write-offs, management’s judgment of the probability of collecting accounts and management’s evaluation of business risk. The Company extends credit to customers satisfying pre-defined credit criteria. The Company believes it has limited concentration of credit risk due to the diversity of its customer base.

Inventories:
Inventories are valued at the lower of cost or market, with approximately 55% valued by the FIFO method and the remaining 45% valued by the LIFO method. The majority of the Company’s domestic inventories are valued by the LIFO method, while all of the Company’s international inventories are valued by the FIFO method.

Investments:
Short-term investments are investments with maturities between four months and one year and are valued at amortized cost, which approximates fair value. The Company held short-term investments as of December 31, 2017 and 2016 with a fair value and cost basis of $16.4 million and $11.7 million, respectively, which were included in other current assets on the Consolidated Balance Sheets.

Property, Plant and Equipment:
Property, plant and equipment, net is valued at cost less accumulated depreciation. Maintenance and repairs are charged to expense as incurred. The provision for depreciation is computed principally by the straight-line method based upon the estimated useful lives of the assets. The useful lives are approximately 30 years for buildings, three to 10 years for computer software and three to 20 years for machinery and equipment.



The impairment of long-lived assets is evaluated when events or changes in circumstances indicate that the carrying amount of the asset or related group of assets may not be recoverable. If the expected future undiscounted cash flows are less than the carrying amount of the asset, an impairment loss is recognized at that time to reduce the asset to the lower of its fair value or its net book value.

Goodwill and Other Intangible Assets:
Intangible assets subject to amortization are amortized on a straight-line method over their legal or estimated useful lives, with useful lives ranging from one to 20 years. Goodwill and indefinite-lived intangible assets not subject to amortization are tested for impairment at least annually. The Company performs its annual impairment test as of October 1st. Furthermore, goodwill and intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying values may not be recoverable in accordance with accounting rules related to goodwill and other intangible assets.

Product Warranties:
The Company provides limited warranties on certain of its products. The Company accrues liabilities for warranties generally based upon specific claims and in certain instances based on historical warranty claim experience in accordance with accounting rules relating to contingent liabilities. When the Company becomes aware of a specific potential warranty claim for which liability is probable and reasonably estimable, a specific charge is recorded and accounted for accordingly. Adjustments are made quarterly to the accruals as claim data and historical experience change.

Income Taxes:
The Company accounts for income taxes in accordance with ASC 740, “Income Taxes.” Deferred tax assets and liabilities are recorded for the future tax consequences attributable to differences between financial statement carrying amounts of existing assets and liabilities and their respective tax bases, as well as net operating loss and tax credit carryforwards. The Company recognizes valuation allowances against deferred tax assets by tax jurisdiction when it is more likely than not those assets will not be realized. Accruals for uncertain tax positions are provided for in accordance with ASC 740-10. The Company recognizes interest and penalties related to uncertain tax positions as a component of income tax expense.

Foreign Currency:
Assets and liabilities of subsidiaries are translated at the rate of exchange in effect on the balance sheet date; income and expenses are translated at the average rates of exchange prevailing during the reporting period. Translation adjustments for assets and liabilities are reflected as a separate component of accumulated other comprehensive loss. Foreign currency gains and losses resulting from transactions are included in the Consolidated Statements of Income.

For the year ended December 31, 2017, the Company recorded a non-cash foreign currency translation adjustment of $44.7 million that increased shareholders’ equity, compared with a non-cash foreign currency translation adjustment of $24.5 million that decreased shareholders’ equity for the year ended December 31, 2016. The foreign currency translation adjustments for the year ended December 31, 2017 were positively impacted by the weakening of the U.S. dollar relative to most other currencies.

The Company recognized a foreign currency exchange loss resulting from transactions of $3.7 million, $5.6 million and $0.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Pension and Other Postretirement Benefits:
Prior to January 1, 2017, the Company recognized an overfunded status or underfunded status (i.e., the difference between the fair value of plan assets and the benefit obligations) as either an asset or a liability for its defined benefit pension and other postretirement benefit plans on the Consolidated Balance Sheets, with a corresponding adjustment to accumulated other comprehensive income, net of tax. The adjustment to accumulated other comprehensive income represented the net unrecognized actuarial gains and losses and unrecognized prior service costs that were amortized in future periods as a component of net periodic benefit cost.





Beginning on January 1, 2017, the Company changed its accounting principles for recognizing actuarial gains and losses and expected returns on plan assets. The Company now recognizes actuarial gains and losses immediately through net periodic benefit cost included in cost of products sold and SG&A expense upon the annual remeasurement in the fourth quarter, or on an interim basis if specific events trigger a remeasurement. Also, the market-related value of plan assets is measured at fair value. These changes in accounting principles were applied retrospectively; therefore, prior period amounts impacted have been revised accordingly herein. For further information, refer to Note 2 - Change in Accounting Principles in the Notes to the Consolidated Financial Statements.

Stock-Based Compensation:
The Company recognizes stock-based compensation expense over the related vesting period of the awards based on the fair value on the grant date. Stock options are issued with an exercise price equal to the opening market price of Timken common shares on the date of grant. The fair value of stock options is determined using a Black-Scholes option pricing model, which incorporates assumptions regarding the expected volatility, the expected option life, the risk-free interest rate and the expected dividend yield. The fair value of stock-based awards that will settle in Timken common shares, other than stock options, is based on the opening market price of Timken common shares on the grant date. The fair value of stock-based awards that will settle in cash are remeasured at each reporting period until settlement of the awards.

Earnings Per Share:
Only certain unvested restricted share grants provide for the payment of nonforfeitable dividends. The Company considers these awards as participating securities. Earnings per share are computed using the two-class method. Basic earnings per share are computed by dividing net income less undistributed earnings allocated to unvested restricted shares by the weighted-average number of common shares outstanding during the year. Diluted earnings per share are computed by dividing net income less undistributed earnings allocated to unvested restricted shares by the weighted-average number of common shares outstanding, adjusted for the dilutive impact of outstanding stock-based awards.

Derivative Instruments:
The Company recognizes all derivatives on the Consolidated Balance Sheets at fair value. Derivatives that are not designated as hedges are adjusted to fair value through earnings. If the derivative is designated and qualifies as a hedge, depending on the nature of the hedge, changes in the fair value of the derivatives are either offset against the change in fair value of the hedged assets, liabilities or firm commitments through earnings or recognized in accumulated other comprehensive loss until the hedged item is recognized in earnings. The Company’s holdings of forward foreign currency exchange contracts qualify as derivatives pursuant to the criteria established in derivative accounting guidance, and the Company has designated certain of those derivatives as hedges.

Use of Estimates:
The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Because actual results could differ from these estimates, the Company reviews and updates these estimates and assumptions regularly to reflect recent experience.















Recent Accounting Pronouncements:

New Accounting Guidance 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." ASU 2016-09 simplifies various aspects of the accounting for stock-based payments. The simplifications include:
a.
recording all tax effects associated with stock-based compensation through the income statement, as opposed to recording certain amounts in other paid-in capital, which eliminates the requirements to calculate a “windfall pool”;
b.
allowing entities to withhold shares to satisfy the employer’s statutory tax withholding requirement up to the highest marginal tax rate applicable to employees rather than the employer’s minimum statutory rate, without requiring liability classification for the award;
c.
modifying the requirement to estimate the number of awards that will ultimately vest by providing an accounting policy election to either estimate the number of forfeitures or recognize forfeitures as they occur;
d.
changing certain presentation requirements in the statement of cash flows, including removing the requirement to present excess tax benefits as an inflow from financing activities and an outflow from operating activities and requiring the cash paid to taxing authorities arising from withheld shares to be classified as a financing activity; and
e.
amending the assumed proceeds from applying the treasury stock method when computing earnings per share to exclude the amount of excess tax benefits that would be recognized in additional paid-in capital.

On January 1, 2017, the Company adopted the provisions of ASU 2016-09. The presentation of shares surrendered by employees to meet the minimum statutory withholding requirement was applied retrospectively in the Consolidated Statement of Cash Flows. As a result of the adoption of ASU 2016-09, $1.9 million and $4.0 million was reclassified from the other accrued expenses line in the operating activities section of the Consolidated Statement of Cash Flows to the shares surrendered for taxes line in the financing activities section for the 12 months ended December 31, 2016 and December 31, 2015, respectively.

In addition, the adoption of ASU 2016-09 resulted in the Company making an accounting policy election to change how it will recognize the number of stock awards that will ultimately vest. In the past, the Company applied a forfeiture rate to shares granted. With the adoption of ASU 2016-09, the Company will recognize forfeitures as they occur. This change resulted in the Company recording a cumulative effect decrease to retained earnings of $1.0 million, as reflected in the Consolidated Statements of Shareholders' Equity. In addition, the Company began recording the tax effects associated with stock-based compensation through the income statement on a prospective basis, which resulted in a tax benefit of $1.9 million for the 12 months ended December 31, 2017. Finally, the Company adjusted dilutive shares to remove the excess tax benefits from the calculation of earnings per share on a prospective basis. The revised calculation is more dilutive, but it did not change earnings per share for prior years.
 
In July 2015, the FASB issued ASU 2015-11, "Inventory (Topic 330): Simplifying the Measurement of Inventory." ASU 2015-11 requires inventory to be measured at the lower of cost and net realizable value, which is defined as the estimated selling price in the ordinary course of business less reasonably predictable costs of completion, disposal and transportation. Under existing guidance, net realizable value is one of several acceptable measures of market value that could be used to measure inventory at the lower of cost or market and, as such, the new guidance reduces the complexity in the measurement. On January 1, 2017, the Company adopted the provisions of ASU 2015-11 on a prospective basis. The adoption of ASU 2015-11 did not have a material impact on the Company's results of operations or financial condition. For our disclosures related to inventories, refer to Note 7 - Inventories.


New Accounting Guidance Issued and Not Yet Adopted:
In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities", which impacts both designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 amends and clarifies the requirements to qualify for hedge accounting, removes the requirement to recognize changes in fair value from certain hedges in current earnings, and specifies the presentation of changes in fair value in the income statement for all hedging instruments. ASU 2017-12 is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including in any interim period for which financial statements have not yet been issued, but the effect of adoption is required to be reflected as of the beginning of the fiscal year of adoption. The Company is currently evaluating the effect that the adoption of ASU 2017-12 will have on the Company's results of operations and financial condition.

In May 2017, the FASB issued ASU 2017-09, "Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting." ASU 2017-09 provides clarity on which changes to the terms or conditions of share-based payment awards require entities to apply the modification accounting provisions required in Topic 718. ASU 2017-09 is effective for public companies for annual reporting periods beginning after December 15, 2017, with early adoption permitted, including adoption in any interim period for which financial statements have not yet been issued. The Company does not expect that the adoption of ASU 2017-09 will have a material impact on the Company's results of operations and financial condition, as the Company does not anticipate future modifications of share-based payment awards.

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.” ASU 2017-07 impacts where the components of net benefit cost are presented within an entity’s income statement. Service cost will be included in other employee compensation costs within operating income and is the only component that may be capitalized when applicable. The other components of net periodic benefit cost will be presented separately outside of operating income. ASU 2017-07 is effective for public companies for annual reporting periods beginning after December 15, 2017 and interim periods within that reporting period. Accordingly, the Company plans to adopt ASU 2017-07 during the first quarter of 2018. The Company's assessment has indicated that the adoption of ASU 2017-07 will result in the reclassification of certain amounts from cost of products sold and SG&A expenses to other income (expense), net in the Consolidated Statement of Income. The amounts impacted include all components of net benefit cost, except for the service cost component, for the Company's defined benefit pension plans and other postretirement benefit plans. The amounts impacted may be material to individual line items on the Consolidated Statement of Income, but will have no impact on the Company's net income. The Company will finalize its analysis on the effect that the adoption of ASU 2017-07 will have on the Company's results of operations during the first quarter of 2018.

In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” Prior to the issuance of the new accounting guidance, entities first assessed qualitative factors to determine whether a two-step goodwill impairment test was necessary. When entities bypassed or failed the qualitative analysis, they were required to apply a two-step goodwill impairment test. Step 1 compared a reporting unit’s fair value to its carrying amount to determine if there is a potential impairment. If the carrying amount of a reporting unit exceeds its fair value, Step 2 was required to be completed. Step 2 involved determining the implied fair value of goodwill and comparing it to the carrying amount of that goodwill to measure the impairment loss, if any. ASU 2017-04 eliminates Step 2 of the current goodwill impairment test. ASU 2017-04 will require that a goodwill impairment loss be measured at the amount by which a reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 is effective for public companies for years beginning after December 15, 2019, with early adoption permitted, and must be applied prospectively. While the effect of adopting ASU 2017-04 will not be known until the period of adoption, the Company currently does not expect it to materially impact the Company's results of operations and financial condition.


In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments." ASU 2016-13 changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The new guidance will replace the current incurred loss approach with an expected loss model. The new expected credit loss impairment model will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt instruments, net investments in leases, loan commitments and standby letters of credit. Upon initial recognition of the exposure, the expected credit loss model requires entities to estimate the credit losses expected over the life of an exposure (or pool of exposures). The estimate of expected credit losses should consider historical information, current information and reasonable and supportable forecasts, including estimates of prepayments. Financial instruments with similar risk characteristics should be grouped together when estimating expected credit losses. ASU 2016-13 does not prescribe a specific method to make the estimate, so its application will require significant judgment. ASU 2016-13 is effective for public companies in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the effect that the adoption of ASU 2016-13 will have on the Company's results of operations and financial condition.

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 was issued to increase transparency and comparability among entities by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about lease arrangements. ASU 2016-02 is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the effect that the adoption of ASU 2016-02 will have on the Company's results of operations and financial condition.
In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)." ASU 2014-09 (the "New Standard”) introduces a new five-step revenue recognition model in which an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments and assets recognized from the costs to obtain or fulfill a contract. On July 9, 2015, the FASB decided to delay the effective date of the New Standard by one year, which will result in it being effective for annual periods beginning after December 15, 2017.
The Company has completed the assessment phase of the project, which has identified certain differences from the application of the New Standard. The Company is currently designing and implementing procedures and related internal controls to address the differences identified, including the expanded disclosure requirements resulting from the New Standard, and will adopt the requirements of the New Standard in the first quarter of 2018. The Company has determined it will use the modified retrospective method of adoption, such that the cumulative effect of applying the New Standard will be recognized at the date of initial application accompanied by additional disclosures comparing the current period results presented under the New Standard to the previous accounting method.

The cumulative-effect adjustment of adopting the New Standard is not expected to be material to the Company's results of operations and financial condition; however, we will expand certain disclosures as required. The anticipated impact principally relates to the acceleration of revenue recognition for certain revenue streams previously accounted for using a point-in-time model that will now utilize an over-time model due to the continuous transfer of control to customers. Additionally, there are other minor policy changes related to the timing and measurement of recognizing revenue and costs to better align our policies with the New Standard that are not expected to result in material changes. The Company's belief that the impact to its results of operations and financial condition is not material is based on an evaluation of its contracts under the New Standard, which only supports the recognition of revenue over time under the cost-to-cost method for a limited number of contracts, primarily in the services, defense, and aerospace market sectors. Revenue on the majority of the Company's contracts will continue to be recognized as of a point in time because the criteria in the New Standard for over time recognition have not been met. Additionally, the Company does not expect material changes to its consolidated balance sheet. The anticipated impact to the consolidated balance sheet primarily relates to reclassifications among financial statement accounts to align with the New Standard and the addition of contract asset and contract liability accounts representing costs in excess of billings for in-process contracts and deferred revenue, respectively, for revenue that is recognized over-time as previously described. The Company's contract balances will be reported in a net contract asset or liability position on a contract-by-contract basis at the end of each reporting period.
Investment, Policy [Policy Text Block] Investments: Short-term investments are investments with maturities between four months and one year and are valued at amortized cost, which approximates fair value. The Company held short-term investments as of December 31, 2017 and 2016 with a fair value and cost basis of $16.4 million and $11.7 million, respectively, which were included in other current assets on the Consolidated Balance Sheets.
Principles of Consolidation Principles of Consolidation: The consolidated financial statements include the accounts and operations of the Company in which a controlling interest is maintained. Investments in affiliated companies where the Company exercises significant influence, but does not control, and the activities of which it is not the primary beneficiary, are accounted for using the equity method. All intercompany accounts and transactions are eliminated upon consolidation.
Revenue Recognition, Policy [Policy Text Block] Revenue Recognition:
The Company recognizes revenue when title passes to the customer. This occurs at the shipping point except for goods sold by certain foreign entities and certain exported goods, where title passes when the goods reach their destination. Selling prices are fixed based on purchase orders or contractual arrangements. Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold in the Consolidated Statements of Income.

Revenue Recognition, Percentage-of-Completion Method [Policy Text Block] The Company recognizes a portion of its revenues on the percentage-of-completion method measured on the cost-to-cost basis. In 2017, 2016 and 2015, the Company recognized $83 million, $68 million, and $66 million, respectively, in net sales under the percentage-of-completion method. As of December 31, 2017 and 2016, net accounts receivable included costs in excess of billings of $67.3 million and $63.5 million, respectively, related to these net sales.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash Equivalents:
The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash:Cash of $3.8 million and $2.7 million at December 31, 2017 and 2016, respectively, was restricted. The increase was primarily due to cash restricted for bank guarantees of $0.5 million and for unclaimed dividends by foreign subsidiaries to minority shareholders of $0.6 million.
Allowance for Doubtful Accounts Allowance for Doubtful Accounts:The Company maintains an allowance for doubtful accounts, which represents an estimate of the losses expected from the accounts receivable portfolio, to reduce accounts receivable to their net realizable value. The allowance is based upon historical trends in collections and write-offs, management’s judgment of the probability of collecting accounts and management’s evaluation of business risk. The Company extends credit to customers satisfying pre-defined credit criteria. The Company believes it has limited concentration of credit risk due to the diversity of its customer base.
Inventory, Policy [Policy Text Block] Inventories: Inventories are valued at the lower of cost or market, with approximately 55% valued by the FIFO method and the remaining 45% valued by the LIFO method. The majority of the Company’s domestic inventories are valued by the LIFO method, while all of the Company’s international inventories are valued by the FIFO method.
Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment:
Property, plant and equipment, net is valued at cost less accumulated depreciation. Maintenance and repairs are charged to expense as incurred. The provision for depreciation is computed principally by the straight-line method based upon the estimated useful lives of the assets. The useful lives are approximately 30 years for buildings, three to 10 years for computer software and three to 20 years for machinery and equipment.



The impairment of long-lived assets is evaluated when events or changes in circumstances indicate that the carrying amount of the asset or related group of assets may not be recoverable. If the expected future undiscounted cash flows are less than the carrying amount of the asset, an impairment loss is recognized at that time to reduce the asset to the lower of its fair value or its net book value.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill and Other Intangible Assets: Intangible assets subject to amortization are amortized on a straight-line method over their legal or estimated useful lives, with useful lives ranging from one to 20 years. Goodwill and indefinite-lived intangible assets not subject to amortization are tested for impairment at least annually. The Company performs its annual impairment test as of October 1st. Furthermore, goodwill and intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying values may not be recoverable in accordance with accounting rules related to goodwill and other intangible assets.
Standard Product Warranty, Policy [Policy Text Block] Product Warranties: The Company provides limited warranties on certain of its products. The Company accrues liabilities for warranties generally based upon specific claims and in certain instances based on historical warranty claim experience in accordance with accounting rules relating to contingent liabilities. When the Company becomes aware of a specific potential warranty claim for which liability is probable and reasonably estimable, a specific charge is recorded and accounted for accordingly. Adjustments are made quarterly to the accruals as claim data and historical experience change.
Income Tax, Policy [Policy Text Block] Income Taxes: The Company accounts for income taxes in accordance with ASC 740, “Income Taxes.” Deferred tax assets and liabilities are recorded for the future tax consequences attributable to differences between financial statement carrying amounts of existing assets and liabilities and their respective tax bases, as well as net operating loss and tax credit carryforwards. The Company recognizes valuation allowances against deferred tax assets by tax jurisdiction when it is more likely than not those assets will not be realized. Accruals for uncertain tax positions are provided for in accordance with ASC 740-10. The Company recognizes interest and penalties related to uncertain tax positions as a component of income tax expense.
Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency:
Assets and liabilities of subsidiaries are translated at the rate of exchange in effect on the balance sheet date; income and expenses are translated at the average rates of exchange prevailing during the reporting period. Translation adjustments for assets and liabilities are reflected as a separate component of accumulated other comprehensive loss. Foreign currency gains and losses resulting from transactions are included in the Consolidated Statements of Income.

For the year ended December 31, 2017, the Company recorded a non-cash foreign currency translation adjustment of $44.7 million that increased shareholders’ equity, compared with a non-cash foreign currency translation adjustment of $24.5 million that decreased shareholders’ equity for the year ended December 31, 2016. The foreign currency translation adjustments for the year ended December 31, 2017 were positively impacted by the weakening of the U.S. dollar relative to most other currencies.

The Company recognized a foreign currency exchange loss resulting from transactions of $3.7 million, $5.6 million and $0.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.
Pension and Other Postretirement Plans, Policy [Policy Text Block] Pension and Other Postretirement Benefits:
Prior to January 1, 2017, the Company recognized an overfunded status or underfunded status (i.e., the difference between the fair value of plan assets and the benefit obligations) as either an asset or a liability for its defined benefit pension and other postretirement benefit plans on the Consolidated Balance Sheets, with a corresponding adjustment to accumulated other comprehensive income, net of tax. The adjustment to accumulated other comprehensive income represented the net unrecognized actuarial gains and losses and unrecognized prior service costs that were amortized in future periods as a component of net periodic benefit cost.





Beginning on January 1, 2017, the Company changed its accounting principles for recognizing actuarial gains and losses and expected returns on plan assets. The Company now recognizes actuarial gains and losses immediately through net periodic benefit cost included in cost of products sold and SG&A expense upon the annual remeasurement in the fourth quarter, or on an interim basis if specific events trigger a remeasurement. Also, the market-related value of plan assets is measured at fair value. These changes in accounting principles were applied retrospectively; therefore, prior period amounts impacted have been revised accordingly herein. For further information, refer to Note 2 - Change in Accounting Principles in the Notes to the Consolidated Financial Statements.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Stock-Based Compensation: The Company recognizes stock-based compensation expense over the related vesting period of the awards based on the fair value on the grant date. Stock options are issued with an exercise price equal to the opening market price of Timken common shares on the date of grant. The fair value of stock options is determined using a Black-Scholes option pricing model, which incorporates assumptions regarding the expected volatility, the expected option life, the risk-free interest rate and the expected dividend yield. The fair value of stock-based awards that will settle in Timken common shares, other than stock options, is based on the opening market price of Timken common shares on the grant date. The fair value of stock-based awards that will settle in cash are remeasured at each reporting period until settlement of the awards.
Earnings Per Share, Policy [Policy Text Block] Earnings Per Share: Only certain unvested restricted share grants provide for the payment of nonforfeitable dividends. The Company considers these awards as participating securities. Earnings per share are computed using the two-class method. Basic earnings per share are computed by dividing net income less undistributed earnings allocated to unvested restricted shares by the weighted-average number of common shares outstanding during the year. Diluted earnings per share are computed by dividing net income less undistributed earnings allocated to unvested restricted shares by the weighted-average number of common shares outstanding, adjusted for the dilutive impact of outstanding stock-based awards.
Derivatives, Policy [Policy Text Block] Derivative Instruments: The Company recognizes all derivatives on the Consolidated Balance Sheets at fair value. Derivatives that are not designated as hedges are adjusted to fair value through earnings. If the derivative is designated and qualifies as a hedge, depending on the nature of the hedge, changes in the fair value of the derivatives are either offset against the change in fair value of the hedged assets, liabilities or firm commitments through earnings or recognized in accumulated other comprehensive loss until the hedged item is recognized in earnings. The Company’s holdings of forward foreign currency exchange contracts qualify as derivatives pursuant to the criteria established in derivative accounting guidance, and the Company has designated certain of those derivatives as hedges.
Use of Estimates, Policy [Policy Text Block] Use of Estimates:
The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Because actual results could differ from these estimates, the Company reviews and updates these estimates and assumptions regularly to reflect recent experience.

New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Guidance 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." ASU 2016-09 simplifies various aspects of the accounting for stock-based payments. The simplifications include:
a.
recording all tax effects associated with stock-based compensation through the income statement, as opposed to recording certain amounts in other paid-in capital, which eliminates the requirements to calculate a “windfall pool”;
b.
allowing entities to withhold shares to satisfy the employer’s statutory tax withholding requirement up to the highest marginal tax rate applicable to employees rather than the employer’s minimum statutory rate, without requiring liability classification for the award;
c.
modifying the requirement to estimate the number of awards that will ultimately vest by providing an accounting policy election to either estimate the number of forfeitures or recognize forfeitures as they occur;
d.
changing certain presentation requirements in the statement of cash flows, including removing the requirement to present excess tax benefits as an inflow from financing activities and an outflow from operating activities and requiring the cash paid to taxing authorities arising from withheld shares to be classified as a financing activity; and
e.
amending the assumed proceeds from applying the treasury stock method when computing earnings per share to exclude the amount of excess tax benefits that would be recognized in additional paid-in capital.

On January 1, 2017, the Company adopted the provisions of ASU 2016-09. The presentation of shares surrendered by employees to meet the minimum statutory withholding requirement was applied retrospectively in the Consolidated Statement of Cash Flows. As a result of the adoption of ASU 2016-09, $1.9 million and $4.0 million was reclassified from the other accrued expenses line in the operating activities section of the Consolidated Statement of Cash Flows to the shares surrendered for taxes line in the financing activities section for the 12 months ended December 31, 2016 and December 31, 2015, respectively.

In addition, the adoption of ASU 2016-09 resulted in the Company making an accounting policy election to change how it will recognize the number of stock awards that will ultimately vest. In the past, the Company applied a forfeiture rate to shares granted. With the adoption of ASU 2016-09, the Company will recognize forfeitures as they occur. This change resulted in the Company recording a cumulative effect decrease to retained earnings of $1.0 million, as reflected in the Consolidated Statements of Shareholders' Equity. In addition, the Company began recording the tax effects associated with stock-based compensation through the income statement on a prospective basis, which resulted in a tax benefit of $1.9 million for the 12 months ended December 31, 2017. Finally, the Company adjusted dilutive shares to remove the excess tax benefits from the calculation of earnings per share on a prospective basis. The revised calculation is more dilutive, but it did not change earnings per share for prior years.
 
In July 2015, the FASB issued ASU 2015-11, "Inventory (Topic 330): Simplifying the Measurement of Inventory." ASU 2015-11 requires inventory to be measured at the lower of cost and net realizable value, which is defined as the estimated selling price in the ordinary course of business less reasonably predictable costs of completion, disposal and transportation. Under existing guidance, net realizable value is one of several acceptable measures of market value that could be used to measure inventory at the lower of cost or market and, as such, the new guidance reduces the complexity in the measurement. On January 1, 2017, the Company adopted the provisions of ASU 2015-11 on a prospective basis. The adoption of ASU 2015-11 did not have a material impact on the Company's results of operations or financial condition. For our disclosures related to inventories, refer to Note 7 - Inventories.


New Accounting Guidance Issued and Not Yet Adopted:
In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities", which impacts both designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 amends and clarifies the requirements to qualify for hedge accounting, removes the requirement to recognize changes in fair value from certain hedges in current earnings, and specifies the presentation of changes in fair value in the income statement for all hedging instruments. ASU 2017-12 is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including in any interim period for which financial statements have not yet been issued, but the effect of adoption is required to be reflected as of the beginning of the fiscal year of adoption. The Company is currently evaluating the effect that the adoption of ASU 2017-12 will have on the Company's results of operations and financial condition.

In May 2017, the FASB issued ASU 2017-09, "Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting." ASU 2017-09 provides clarity on which changes to the terms or conditions of share-based payment awards require entities to apply the modification accounting provisions required in Topic 718. ASU 2017-09 is effective for public companies for annual reporting periods beginning after December 15, 2017, with early adoption permitted, including adoption in any interim period for which financial statements have not yet been issued. The Company does not expect that the adoption of ASU 2017-09 will have a material impact on the Company's results of operations and financial condition, as the Company does not anticipate future modifications of share-based payment awards.

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.” ASU 2017-07 impacts where the components of net benefit cost are presented within an entity’s income statement. Service cost will be included in other employee compensation costs within operating income and is the only component that may be capitalized when applicable. The other components of net periodic benefit cost will be presented separately outside of operating income. ASU 2017-07 is effective for public companies for annual reporting periods beginning after December 15, 2017 and interim periods within that reporting period. Accordingly, the Company plans to adopt ASU 2017-07 during the first quarter of 2018. The Company's assessment has indicated that the adoption of ASU 2017-07 will result in the reclassification of certain amounts from cost of products sold and SG&A expenses to other income (expense), net in the Consolidated Statement of Income. The amounts impacted include all components of net benefit cost, except for the service cost component, for the Company's defined benefit pension plans and other postretirement benefit plans. The amounts impacted may be material to individual line items on the Consolidated Statement of Income, but will have no impact on the Company's net income. The Company will finalize its analysis on the effect that the adoption of ASU 2017-07 will have on the Company's results of operations during the first quarter of 2018.

In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” Prior to the issuance of the new accounting guidance, entities first assessed qualitative factors to determine whether a two-step goodwill impairment test was necessary. When entities bypassed or failed the qualitative analysis, they were required to apply a two-step goodwill impairment test. Step 1 compared a reporting unit’s fair value to its carrying amount to determine if there is a potential impairment. If the carrying amount of a reporting unit exceeds its fair value, Step 2 was required to be completed. Step 2 involved determining the implied fair value of goodwill and comparing it to the carrying amount of that goodwill to measure the impairment loss, if any. ASU 2017-04 eliminates Step 2 of the current goodwill impairment test. ASU 2017-04 will require that a goodwill impairment loss be measured at the amount by which a reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 is effective for public companies for years beginning after December 15, 2019, with early adoption permitted, and must be applied prospectively. While the effect of adopting ASU 2017-04 will not be known until the period of adoption, the Company currently does not expect it to materially impact the Company's results of operations and financial condition.


In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments." ASU 2016-13 changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The new guidance will replace the current incurred loss approach with an expected loss model. The new expected credit loss impairment model will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt instruments, net investments in leases, loan commitments and standby letters of credit. Upon initial recognition of the exposure, the expected credit loss model requires entities to estimate the credit losses expected over the life of an exposure (or pool of exposures). The estimate of expected credit losses should consider historical information, current information and reasonable and supportable forecasts, including estimates of prepayments. Financial instruments with similar risk characteristics should be grouped together when estimating expected credit losses. ASU 2016-13 does not prescribe a specific method to make the estimate, so its application will require significant judgment. ASU 2016-13 is effective for public companies in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently evaluating the effect that the adoption of ASU 2016-13 will have on the Company's results of operations and financial condition.

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 was issued to increase transparency and comparability among entities by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about lease arrangements. ASU 2016-02 is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company is currently evaluating the effect that the adoption of ASU 2016-02 will have on the Company's results of operations and financial condition.
In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)." ASU 2014-09 (the "New Standard”) introduces a new five-step revenue recognition model in which an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires disclosures sufficient to enable users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including qualitative and quantitative disclosures about contracts with customers, significant judgments and changes in judgments and assets recognized from the costs to obtain or fulfill a contract. On July 9, 2015, the FASB decided to delay the effective date of the New Standard by one year, which will result in it being effective for annual periods beginning after December 15, 2017.
The Company has completed the assessment phase of the project, which has identified certain differences from the application of the New Standard. The Company is currently designing and implementing procedures and related internal controls to address the differences identified, including the expanded disclosure requirements resulting from the New Standard, and will adopt the requirements of the New Standard in the first quarter of 2018. The Company has determined it will use the modified retrospective method of adoption, such that the cumulative effect of applying the New Standard will be recognized at the date of initial application accompanied by additional disclosures comparing the current period results presented under the New Standard to the previous accounting method.

The cumulative-effect adjustment of adopting the New Standard is not expected to be material to the Company's results of operations and financial condition; however, we will expand certain disclosures as required. The anticipated impact principally relates to the acceleration of revenue recognition for certain revenue streams previously accounted for using a point-in-time model that will now utilize an over-time model due to the continuous transfer of control to customers. Additionally, there are other minor policy changes related to the timing and measurement of recognizing revenue and costs to better align our policies with the New Standard that are not expected to result in material changes. The Company's belief that the impact to its results of operations and financial condition is not material is based on an evaluation of its contracts under the New Standard, which only supports the recognition of revenue over time under the cost-to-cost method for a limited number of contracts, primarily in the services, defense, and aerospace market sectors. Revenue on the majority of the Company's contracts will continue to be recognized as of a point in time because the criteria in the New Standard for over time recognition have not been met. Additionally, the Company does not expect material changes to its consolidated balance sheet. The anticipated impact to the consolidated balance sheet primarily relates to reclassifications among financial statement accounts to align with the New Standard and the addition of contract asset and contract liability accounts representing costs in excess of billings for in-process contracts and deferred revenue, respectively, for revenue that is recognized over-time as previously described. The Company's contract balances will be reported in a net contract asset or liability position on a contract-by-contract basis at the end of each reporting period.