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[Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Number of cases that will proceed to judicial determination (in cases) Number Of Cases That Will Proceed To Judicial Determination Number Of Cases That Will Proceed To Judicial Determination Georgia GEORGIA Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Net income (loss) per common share attributable to Sotera Health Company common shareholders - basic (in dollars per share) Earnings Per Share, Basic Deferred revenues Contract with Customer, Liability, Current Total current assets Assets, Current Insider Trading Arrangements [Line Items] Acquired Indefinite-lived Intangible Assets [Line Items] Intangible Asset, Indefinite-Lived, Acquired [Line Items] Schedule of Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Long-Term debt Long-Term debt Long-Term Debt, Excluding Current Maturities Total cost of revenues Cost of Revenue Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowance for uncollectible accounts of $2,812 and $2,968, respectively Accounts Receivable, after Allowance for Credit Loss, Current Retained deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Defined Benefit Pension Plan Pension Plan [Member] Unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Professional services relating to EO sterilization facilities Litigation Settlement, Fee Expense Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Derivative Contract [Domain] Derivative Contract [Domain] Changes due to foreign currency exchange rates Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and equity Liabilities and Equity Sealed source and supply agreements Sealed Source And Supply Agreements [Member] Sealed Source And Supply Agreements Prepaid maintenance contracts Prepaid Maintenance Contracts, Current Prepaid Maintenance Contracts, Current Stock options Stock Options Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Inventory Disclosure [Abstract] Nelson Labs Nelson Labs [Member] Nelson Labs Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Other income, net Other Nonoperating Income (Expense) Schedule of Acquired Indefinite-Lived Intangible Assets Intangible Asset, Indefinite-Lived, Acquired [Table Text Block] Accretion of asset retirement obligations Asset Retirement Obligation, Accretion Expense 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three For the remainder of 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Income taxes receivable Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] 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] Less: Allocation to participating securities, Diluted Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Raw materials and supplies Inventory, Raw Materials and Supplies, Gross Preferred stock, with $0.01 par value, 120,000 shares authorized; no shares issued at June 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Number of pending claims Loss Contingency, Pending Claims, Number Hedging Designation [Domain] Hedging Designation [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Prepaid taxes Prepaid Taxes Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Foreign currency forward contract liabilities Foreign Exchange Forward [Member] Hedging Designation [Axis] Hedging Designation [Axis] Less: Allocation to participating securities, Basic Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Reserve for excess and obsolete inventory Inventory Adjustments Name Measure Name Illinois ILLINOIS Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Other current assets Increase (Decrease) in Other Current Assets Long-Term debt Long Term Debt Gross Noncurrent Long Term Debt Gross Noncurrent Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Selected as the First Plaintiff Group Selected as the First Plaintiff Group [Member] Selected as the First Plaintiff Group Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Interest rate Debt Instrument, Interest Rate During Period Basis of Presentation Basis of Accounting [Text Block] Company Selected Measure Amount Company Selected Measure Amount Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] Depreciation and amortization Depreciation, Depletion and Amortization Inventories, gross Inventory, Gross SOFR Secured Overnight Financing Rate (SOFR) [Member] Entity Address, Address Line Two Entity Address, Address Line Two Share-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Interest Rate Cap Interest Rate Cap [Member] Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Land-use rights Land-Use Rights [Member] Land-Use Rights Provision for income taxes Income Tax Expense (Benefit) Foreign exchange (gain) loss, net Gain (Loss), Foreign Currency Transaction, before Tax Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net increase in cash and cash equivalents, including restricted cash 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] Sterigenics Sterigenics [Member] Sterigenics Amortization of net actuarial gain Defined Benefit Plan, Amortization of Gain (Loss) Recent Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income (loss) Net income (loss) Net income (loss) 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] Segment Reporting, Reconciling Item, Excluding Corporate Non Segment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Illinois EO litigation settlements Litigation Settlement, Nonoperating Expense Litigation Settlement, Nonoperating Expense Derivative Assets Derivative asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Number of new claims filed Loss Contingency, New Claims Filed, Number Unrealized foreign exchange (gain) loss Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]