Basis of Presentation and Consolidation (Policies)	9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]
Principles of Consolidation	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) 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, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. There is a year-round demand for passenger car and truck replacement tires, but passenger car replacement tire sales are generally strongest during the third and fourth quarters of the year. Winter tires are sold principally during the months of June through November. Operating results for the nine month period ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ended December 31, 2019. The Company consolidates into its financial statements the accounts of the Company, all wholly-owned subsidiaries, and any partially-owned subsidiary that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50 percent owned are consolidated, investments in affiliates of 50 percent or less but greater than 20 percent are accounted for using the equity method, and investments in affiliates of 20 percent or less are accounted for using the cost method. The Company does not consolidate any entity for which it has a variable interest based solely on power to direct the activities and significant participation in the entity’s expected results that would not otherwise be consolidated based on control through voting interests. Further, the Company’s joint ventures are businesses established and maintained in connection with the Company’s operating strategy. All intercompany transactions and balances have been eliminated.
Earnings per common share	Net income per share is computed on the basis of the weighted average number of common shares outstanding each year. Diluted earnings per share includes the dilutive effect of stock options and other stock units.
Warranties	Warranties – Warranties are provided on the sale of certain of the Company’s products and an accrual for estimated future claims is recorded at the time revenue is recognized. Tire replacement under most of the warranties the Company offers is on a prorated basis. The Company provides for the estimated cost of product warranties based primarily on historical return rates, estimates of the eligible tire population and the value of tires to be replaced. The following table summarizes the activity in the Company’s product warranty liabilities, which are recorded in Accrued liabilities and Other long-term liabilities on the Company’s Condensed Consolidated Balance Sheets:
Recent Accounting Pronouncements	Each change to U.S. GAAP is established by the Financial Accounting Standards Board (“FASB”) in the form of an accounting standards update (“ASU”) to the FASB’s Accounting Standards Codification (“ASC”). The Company considers the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements. Accounting Pronouncements – Recently adopted SEC Disclosure Regulation Simplifications During the fourth quarter of 2018, the U.S. Securities and Exchange Commission (“SEC”) published Final Rule Release No. 33-10532, "Disclosure Update and Simplification." This standard, effective for quarterly and annual reports submitted after November 5, 2018, streamlines disclosure requirements by removing certain redundant topics. For the Company, the most notable simplification implemented in 2019 was the expansion of the shareholders' equity reconciliation to display quarter-to-quarter details beginning in the first quarter of 2019. The changes to the SEC rules impacted the presentation of the Company's filings, but did not materially impact the Company's condensed consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02, “Leases,” which requires balance sheet recognition of lease liabilities and right-of-use assets for most leases having terms of twelve months or longer. The Company adopted the standard on the required effective date of January 1, 2019 using the transition option, “Comparatives Under 840 Option,” established by ASU 2018-11, Leases (Topic 842), Targeted Improvements (ASU 2018-11). The FASB issued multiple amendments to the standard which provided clarification, additional guidance, practical expedients and other improvements to ASU 2016-02. The new guidance requires recognition of lease assets and liabilities for operating leases with terms of more than 12 months, in addition to those currently recorded, on the Company's Condensed Consolidated Balance Sheets. See Note 9 for additional details. Derivatives and Hedging In August 2017, the FASB issued ASU 2017-12, “Targeted Improvements to Accounting for Hedging Activities,” which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The Company adopted this standard effective January 1, 2019. The adoption of this standard did not materially impact the Company's condensed consolidated financial statements. Additionally, in October 2018, the FASB issued ASU 2018-16, "Derivatives and Hedging (Topic 815)." The Federal Reserve and Alternative Reference Rates Committee expressed the importance of including the Overnight Index Swap ("OIS") rate based on Secured Overnight Financing Rate ("SOFR") as a benchmark rate for hedge accounting purposes in facilitating broader use of the underlying SOFR rate in the marketplace to facilitate the market's move away from the London Interbank Offered Rate ("LIBOR"). This update, effective on January 1, 2019, provides the option to use the OIS rate based on SOFR as a benchmark for hedge accounting. The Company does not currently hold any SOFR-based instruments, but will continue to evaluate its use as the markets transition away from LIBOR. Accounting Pronouncements – To be adopted Credit Losses In June 2016, the FASB issued ASU 2016-13, "Measurement of Credit Losses on Financial Instruments," which changes accounting requirements for the recognition of credit losses from an incurred or probable impairment methodology to a current expected credit losses (CECL) methodology. The FASB issued subsequent amendments to the initial guidance in November 2018, April 2019 and May 2019 with ASU 2018-19, ASU 2019-04 and ASU 2019-05, respectively. Trade receivables (including the allowance for doubtful accounts) is the only financial instrument in scope for ASU 2016-13 currently held by the Company. Implementation is anticipated to include an update to the Company's allowance for doubtful accounts methodology and related disclosures, but with minimal impact on the condensed consolidated financial statements. This standard is effective for interim and annual reporting periods beginning after December 15, 2019 with a modified retrospective approach. Early adoption is permitted but not part of the Company's implementation plan. Fair Value Measurement In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820)," which removes, modifies and adds various disclosure requirements around the topic in order to clarify and improve the cost-benefit nature of disclosures. For example, disclosures around transfers between fair value hierarchy levels will be removed and further detail around changes in unrealized gains and losses for the period and unobservable inputs determining level 3 fair value measurements will be added. This standard is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements. Defined Benefit Plans In August 2018, the FASB issued ASU 2018-14, "Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20)," which removes, modifies and adds various disclosure requirements around the topic in order to clarify and improve the cost-benefit nature of disclosures. For example, disclosures around the effect of a one-percentage-point change in assumed health care costs will be removed and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period will be added. This standard is effective for fiscal years ending after December 15, 2020, and early adoption is permitted. These amendments must be applied on a retrospective basis for all periods presented. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements. Internal-Use Software In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)," which aligns the requirements for capitalizing implementation costs incurred in a service contract hosting arrangement with those of developing or obtaining internal-use software. This standard is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements. Related Parties In October 2018, the FASB issued ASU 2018-17 "Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for VIEs." When determining if fees paid to decision makers and service providers are variable interests, entities must now also consider indirect interests of those decision makers and service providers held through related parties under common control. This standard is effective January 1, 2020, with early adoption permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.

Basis of Presentation and Consolidation (Policies)

9 Months Ended

Sep. 30, 2019

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) 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, the condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation.

There is a year-round demand for passenger car and truck replacement tires, but passenger car replacement tire sales are generally strongest during the third and fourth quarters of the year. Winter tires are sold principally during the months of June through November. Operating results for the nine month period ended September 30, 2019 are not necessarily indicative of the results that may be expected for the year ended December 31, 2019.

The Company consolidates into its financial statements the accounts of the Company, all wholly-owned subsidiaries, and any partially-owned subsidiary that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50 percent owned are consolidated, investments in affiliates of 50 percent or less but greater than 20 percent are accounted for using the equity method, and investments in affiliates of 20 percent or less are accounted for using the cost method. The Company does not consolidate any entity for which it has a variable interest based solely on power to direct the activities and significant participation in the entity’s expected results that would not otherwise be consolidated based on control through voting interests. Further, the Company’s joint ventures are businesses established and maintained in connection with the Company’s operating strategy. All intercompany transactions and balances have been eliminated.

Earnings per common share

Net income per share is computed on the basis of the weighted average number of common shares outstanding each year. Diluted earnings per share includes the dilutive effect of stock options and other stock units.

Warranties

Warranties – Warranties are provided on the sale of certain of the Company’s products and an accrual for estimated future claims is recorded at the time revenue is recognized. Tire replacement under most of the warranties the Company offers is on a prorated basis. The Company provides for the estimated cost of product warranties based primarily on historical return rates, estimates of the eligible tire population and the value of tires to be replaced. The following table summarizes the activity in the Company’s product warranty liabilities, which are recorded in Accrued liabilities and Other long-term liabilities on the Company’s Condensed Consolidated Balance Sheets:

Recent Accounting Pronouncements

Each change to U.S. GAAP is established by the Financial Accounting Standards Board (“FASB”) in the form of an accounting standards update (“ASU”) to the FASB’s Accounting Standards Codification (“ASC”).

The Company considers the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s condensed consolidated financial statements.

Accounting Pronouncements – Recently adopted

SEC Disclosure Regulation Simplifications

During the fourth quarter of 2018, the U.S. Securities and Exchange Commission (“SEC”) published Final Rule Release No. 33-10532, "Disclosure Update and Simplification." This standard, effective for quarterly and annual reports submitted after November 5, 2018, streamlines disclosure requirements by removing certain redundant topics. For the Company, the most notable simplification implemented in 2019 was the expansion of the shareholders' equity reconciliation to display quarter-to-quarter details beginning in the first quarter of 2019. The changes to the SEC rules impacted the presentation of the Company's filings, but did not materially impact the Company's condensed consolidated financial statements.

Leases

In February 2016, the FASB issued ASU 2016-02, “Leases,” which requires balance sheet recognition of lease liabilities and right-of-use assets for most leases having terms of twelve months or longer. The Company adopted the standard on the required effective date of January 1, 2019 using the transition option, “Comparatives Under 840 Option,” established by ASU 2018-11, Leases (Topic 842), Targeted Improvements (ASU 2018-11). The FASB issued multiple amendments to the standard which provided clarification, additional guidance, practical expedients and other improvements to ASU 2016-02. The new guidance requires recognition of lease assets and liabilities for operating leases with terms of more than 12 months, in addition to those currently recorded, on the Company's Condensed Consolidated Balance Sheets. See Note 9 for additional details.

Derivatives and Hedging

In August 2017, the FASB issued ASU 2017-12, “Targeted Improvements to Accounting for Hedging Activities,” which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. The Company adopted this standard effective January 1, 2019. The adoption of this standard did not materially impact the Company's condensed consolidated financial statements.

Additionally, in October 2018, the FASB issued ASU 2018-16, "Derivatives and Hedging (Topic 815)." The Federal Reserve and Alternative Reference Rates Committee expressed the importance of including the Overnight Index Swap ("OIS") rate based on Secured Overnight Financing Rate ("SOFR") as a benchmark rate for hedge accounting purposes in facilitating broader use of the underlying SOFR rate in the marketplace to facilitate the market's move away from the London Interbank

Offered Rate ("LIBOR"). This update, effective on January 1, 2019, provides the option to use the OIS rate based on SOFR as a benchmark for hedge accounting. The Company does not currently hold any SOFR-based instruments, but will continue to evaluate its use as the markets transition away from LIBOR.

Accounting Pronouncements – To be adopted

Credit Losses

In June 2016, the FASB issued ASU 2016-13, "Measurement of Credit Losses on Financial Instruments," which changes accounting requirements for the recognition of credit losses from an incurred or probable impairment methodology to a current expected credit losses (CECL) methodology. The FASB issued subsequent amendments to the initial guidance in November 2018, April 2019 and May 2019 with ASU 2018-19, ASU 2019-04 and ASU 2019-05, respectively. Trade receivables (including the allowance for doubtful accounts) is the only financial instrument in scope for ASU 2016-13 currently held by the Company. Implementation is anticipated to include an update to the Company's allowance for doubtful accounts methodology and related disclosures, but with minimal impact on the condensed consolidated financial statements. This standard is effective for interim and annual reporting periods beginning after December 15, 2019 with a modified retrospective approach. Early adoption is permitted but not part of the Company's implementation plan.

Fair Value Measurement

In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820)," which removes, modifies and adds various disclosure requirements around the topic in order to clarify and improve the cost-benefit nature of disclosures. For example, disclosures around transfers between fair value hierarchy levels will be removed and further detail around changes in unrealized gains and losses for the period and unobservable inputs determining level 3 fair value measurements will be added. This standard is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.

Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, "Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20)," which removes, modifies and adds various disclosure requirements around the topic in order to clarify and improve the cost-benefit nature of disclosures. For example, disclosures around the effect of a one-percentage-point change in assumed health care costs will be removed and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period will be added. This standard is effective for fiscal years ending after December 15, 2020, and early adoption is permitted. These amendments must be applied on a retrospective basis for all periods presented. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.

Internal-Use Software

In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)," which aligns the requirements for capitalizing implementation costs incurred in a service contract hosting arrangement with those of developing or obtaining internal-use software. This standard is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.

Related Parties

In October 2018, the FASB issued ASU 2018-17 "Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for VIEs." When determining if fees paid to decision makers and service providers are variable interests, entities must now also consider indirect interests of those decision makers and service providers held through related parties under common control. This standard is effective January 1, 2020, with early adoption permitted. The Company is currently evaluating the impact the new standard will have on its condensed consolidated financial statements.