Basis of Presentation and Consolidation (Policies)	6 Months Ended
Jun. 30, 2020
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 typically a year-round demand for the Company's products, however, passenger car and light truck ("light vehicle") replacement tire sales are generally strongest during the third and fourth quarters of the year. Winter tires are sold principally during the months of May through November. Operating results for the six month period ended June 30, 2020 are not necessarily indicative of the results that may be expected for the year ended December 31, 2020. 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 and investments in affiliates of 50 percent or less, but greater than 20 percent, are accounted for using the equity 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 period. When applicable, diluted earnings per share includes the dilutive effect of stock options and other stock units.
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. Accounting Pronouncements – Recently adopted 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. Such modifications to disclosures center around Level 3 fair value measurements and investments in entities that calculate net asset value. This standard is effective for interim and annual reporting periods beginning after December 15, 2019 and has been adopted by the Company effective January 1, 2020. The adoption of this standard did not materially impact the Company's 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 has been adopted prospectively by the Company effective January 1, 2020. Capitalization of implementation costs incurred in a service contract hosting arrangement affects Intangibles, net of accumulated amortization, Cost of products sold, and Selling, general, and administrative expense within the condensed consolidated financial statements. The adoption of this standard did not materially impact the Company's condensed consolidated financial statements. Accounting for Income Taxes On December 18, 2019, the FASB issued ASU 2019-12, "Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes," to, among other provisions, eliminate certain exceptions related to intra-period tax allocation and loss benefit limitations in interim periods, as well as certain rules pertaining to deferred taxes for equity method investees. This ASU also simplifies rules pertaining to franchise taxes and other taxes partially based on income, and changes the timing of when an entity recognizes effects of enacted tax law changes. This standard becomes effective in fiscal years beginning after December 15, 2020; however, the Company chose to early adopt in the period ended March 31, 2020. The adoption of this standard did not materially impact the Company's condensed consolidated financial statements. Accounting Pronouncements – To be adopted 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. Reference Rate Reform In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848)," which provides optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. These amendments are effective immediately and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The Company is currently evaluating its contracts and the optional expedients provided by the new standard and the impact it will have on the condensed consolidated financial statements.

Basis of Presentation and Consolidation (Policies)

6 Months Ended

Jun. 30, 2020

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 typically a year-round demand for the Company's products, however, passenger car and light truck ("light vehicle") replacement tire sales are generally strongest during the third and fourth quarters of the year. Winter tires are sold principally during the months of May through November. Operating results for the six month period ended June 30, 2020 are not necessarily indicative of the results that may be expected for the year ended December 31, 2020.

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 and investments in affiliates of 50 percent or less, but greater than 20 percent, are accounted for using the equity 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 period. When applicable, diluted earnings per share includes the dilutive effect of stock options and other stock units.

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.

Accounting Pronouncements – Recently adopted

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. Such modifications to disclosures center around Level 3 fair value measurements and investments in entities that calculate net asset value. This standard is effective for interim and annual reporting periods beginning after December 15, 2019 and has been adopted by the Company effective January 1, 2020. The adoption of this standard did not materially impact the Company's 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 has been adopted prospectively by the Company effective January 1, 2020. Capitalization of implementation costs incurred in a service contract hosting arrangement affects Intangibles, net of accumulated amortization, Cost of products sold, and Selling, general, and administrative expense within the condensed consolidated financial statements. The adoption of this standard did not materially impact the Company's condensed consolidated financial statements.

Accounting for Income Taxes

On December 18, 2019, the FASB issued ASU 2019-12, "Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes," to, among other provisions, eliminate certain exceptions related to intra-period tax allocation and loss benefit limitations in interim periods, as well as certain rules pertaining to deferred taxes for equity method investees. This ASU also simplifies rules pertaining to franchise taxes and other taxes partially based on income, and changes the timing of when an entity recognizes effects of enacted tax law changes. This standard becomes effective in fiscal years beginning after December 15, 2020; however, the Company chose to early adopt in the period ended March 31, 2020. The adoption of this standard did not materially impact the Company's condensed consolidated financial statements.

Accounting Pronouncements – To be adopted

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.

Reference Rate Reform

In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848)," which provides optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. These amendments are effective immediately and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The Company is currently evaluating its contracts and the optional expedients provided by the new standard and the impact it will have on the condensed consolidated financial statements.