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income tax expense (benefit) of $0 in the third quarter 2026, $0 in the third quarter 2025, $0 in the nine months 2026, and $0 in nine months 2025 Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Plan [Member] Pension Plan [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and shareholders’ equity Liabilities and Equity Intangibles (net of amortization) and goodwill Net carrying amount of intangibles and goodwill Intangible Asset, Including Goodwill, after Accumulated Amortization Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segment Reporting Information, by Segment [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Amortization of prior service cost (credit) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(176) for the second quarter 2026; $(175) for the second quarter 2025; $(351) for the six months 2026, and $(352) for the six months 2025 Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Other income (expense), net Other Nonoperating Income (Expense) 2031 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five Repayments of Senior Debt Repayments of Senior Debt 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Accruals for environmental remediation, dismantling, and decontamination, undiscounted Accrual for Environmental Loss Contingencies, Gross Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Cash Contributions Made And Expected Remaining Contributions For Pension And Postretirement Benefit Plans Schedule of Defined Benefit Plans Disclosures [Table Text Block] Trade and other accounts receivable, less allowance for credit losses Receivables, Net, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Revolving Credit Facility [Member] Domestic Line of Credit [Member] Earnings per share denominator: Denominator [Abstract] Denominator [Abstract] Amounts reclassified from accumulated other comprehensive loss, Accumulated Other Comprehensive (Loss) Income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Petroleum Additives [Member] Petroleum Additives [Member] Represents petroleum additives segment of business, which include a variety of products that are used in lubricating oils and fuels to enhance their performance in machinery, vehicles, and other equipment. Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Earnings per share numerator: Numerator [Abstract] Numerator [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Cash pension and postretirement contributions Payment for Pension and Other Postretirement Benefits Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] All Other [Member] Other Operating Segment [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Intangible Asset, Indefinite-Lived, Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Carrying amount of cash and cash equivalents in the Consolidated Balance Sheets Cash and Cash Equivalent Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Raw materials Inventory, Raw Materials, Net of Reserves Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income Tax Expense (Benefit) Cost of goods sold Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amortization of actuarial net (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income Net income Net income attributable to common shareholders before allocation of earnings to participating securities Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Formulas And Technology [Member] Trade Secrets [Member] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Components of Accumulated Other Comprehensive Loss, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Net borrowings (repayments) under revolving credit facility Proceeds from (Repayments of) Lines of Credit Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Prepaid expenses and other current assets Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current Chief Executive Officer [Member]