Basis of Presentation (Policies)	9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting Policy	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP 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.
Reclassifications Policy	Certain amounts in the 2015 condensed consolidated financial statements have been reclassified to conform to the 2016 presentation.
Inventory Policy	The Company primarily uses the last-in, first-out (LIFO) method of valuing inventory. An actual valuation of inventory under the LIFO method can be made only at the end of each year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations are based on management’s estimates of expected year-end inventory levels and costs are subject to the final year-end LIFO inventory valuation. In addition, interim inventory levels include management’s estimates of annual inventory losses due to shrinkage and other factors. The final year-end valuation of inventory is based on an annual physical inventory count performed during the fourth quarter. For further information on inventory valuations and other matters, refer to the consolidated financial statements and footnotes thereto included in the Company’s Form 10-K for the year ended December 31, 2015.
Impact of Recently Issued Accounting Pronouncements	During the second quarter of 2016, the Company early adopted, as permitted, ASU No. 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which simplifies various provisions related to how share-based payments are accounted for and presented in the financial statements. Excess tax benefits for share-based payments are no longer recognized in other capital on the balance sheet and now will be recognized in the income tax provision on the income statement. In addition, excess tax benefits for share-based payments are now included in Net operating cash rather than Net financing cash. The changes have been applied prospectively in accordance with the ASU and prior periods have not been adjusted. Refer to Note 11 for additional information. Effective January 1, 2016, the Company adopted the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, "Simplifying the Presentation of Debt Issuance Costs," which requires companies to present debt issuance costs associated with a debt liability as a deduction from the carrying amount of that debt liability on the balance sheet rather than being capitalized as an asset. The adoption of this ASU did not have a material effect on the Company's results of operations, financial condition or liquidity. In February 2016, the FASB issued ASU No. 2016-02, “Leases,” which consists of a comprehensive lease accounting standard. Under the new standard, assets and liabilities arising from most leases will be recognized on the balance sheet. Leases will be classified as either operating or financing, and the lease classification will determine whether expense is recognized on a straight line basis (operating leases) or based on an effective interest method (financing leases). The new standard is effective for interim and annual periods beginning after December 15, 2018. A modified retrospective transition approach is required with certain practical expedients available. The Company is currently in the process of evaluating the impact of this standard. In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities,” which amends the guidance for certain aspects of recognition, measurement and disclosure of financial instruments. The standard is effective for interim and annual periods beginning after December 31, 2017, and early adoption is not permitted. The Company is in the process of evaluating the impact of the standard. In November 2015, the FASB issued ASU No. 2015-17, "Balance Sheet Classification of Deferred Taxes," which eliminates the requirement for separate presentation of current and non-current portions of deferred tax. All deferred tax assets and deferred tax liabilities will be presented as non-current on the balance sheet. The standard is effective for interim and annual periods beginning after December 15, 2016. Either retrospective or prospective presentation can be used. The Company will adopt ASU No. 2015-17 as required. The ASU will not have a material effect on the Company's results of operations, financial condition or liquidity. In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers," which consists of a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under U.S. GAAP. The issuance of ASU No. 2015-14 in August 2015 delays the effective date of the standard to interim and annual periods beginning after December 15, 2017. Either full retrospective adoption or modified retrospective adoption is permitted. The Company is in the process of evaluating the impact of the standard.

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP 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.

Reclassifications Policy

Certain amounts in the 2015 condensed consolidated financial statements have been reclassified to conform to the 2016 presentation.

Inventory Policy

The Company primarily uses the last-in, first-out (LIFO) method of valuing inventory. An actual valuation of inventory under the LIFO method can be made only at the end of each year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations are based on management’s estimates of expected year-end inventory levels and costs are subject to the final year-end LIFO inventory valuation. In addition, interim inventory levels include management’s estimates of annual inventory losses due to shrinkage and other factors. The final year-end valuation of inventory is based on an annual physical inventory count performed during the fourth quarter. For further information on inventory valuations and other matters, refer to the consolidated financial statements and footnotes thereto included in the Company’s Form 10-K for the year ended December 31, 2015.

Impact of Recently Issued Accounting Pronouncements

During the second quarter of 2016, the Company early adopted, as permitted, ASU No. 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which simplifies various provisions related to how share-based payments are accounted for and presented in the financial statements. Excess tax benefits for share-based payments are no longer recognized in other capital on the balance sheet and now will be recognized in the income tax provision on the income statement. In addition, excess tax benefits for share-based payments are now included in Net operating cash rather than Net financing cash. The changes have been applied prospectively in accordance with the ASU and prior periods have not been adjusted. Refer to Note 11 for additional information.

Effective January 1, 2016, the Company adopted the Financial Accounting Standards Board (FASB) issued ASU No. 2015-03, "Simplifying the Presentation of Debt Issuance Costs," which requires companies to present debt issuance costs associated with a debt liability as a deduction from the carrying amount of that debt liability on the balance sheet rather than being capitalized as an asset. The adoption of this ASU did not have a material effect on the Company's results of operations, financial condition or liquidity.

In February 2016, the FASB issued ASU No. 2016-02, “Leases,” which consists of a comprehensive lease accounting standard. Under the new standard, assets and liabilities arising from most leases will be recognized on the balance sheet. Leases will be classified as either operating or financing, and the lease classification will determine whether expense is recognized on a straight line basis (operating leases) or based on an effective interest method (financing leases). The new standard is effective for interim and annual periods beginning after December 15, 2018. A modified retrospective transition approach is required with certain practical expedients available. The Company is currently in the process of evaluating the impact of this standard.

In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities,” which amends the guidance for certain aspects of recognition, measurement and disclosure of financial instruments. The standard is effective for interim and annual periods beginning after December 31, 2017, and early adoption is not permitted. The Company is in the process of evaluating the impact of the standard.

In November 2015, the FASB issued ASU No. 2015-17, "Balance Sheet Classification of Deferred Taxes," which eliminates the requirement for separate presentation of current and non-current portions of deferred tax. All deferred tax assets and deferred tax liabilities will be presented as non-current on the balance sheet. The standard is effective for interim and annual periods beginning after December 15, 2016. Either retrospective or prospective presentation can be used. The Company will adopt ASU No. 2015-17 as required. The ASU will not have a material effect on the Company's results of operations, financial condition or liquidity.

In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers," which consists of a comprehensive revenue recognition standard that will supersede nearly all existing revenue recognition guidance under U.S. GAAP. The issuance of ASU No. 2015-14 in August 2015 delays the effective date of the standard to interim and annual periods beginning after December 15, 2017. Either full retrospective adoption or modified retrospective adoption is permitted. The Company is in the process of evaluating the impact of the standard.