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Master Netting Arrangement, before Offset Pension and post-retirement benefits (net of taxes of $(45), $(43), $2, and $(54), respectively) Pension and post-retirement plan adjustments, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Measure: Measure [Axis] Share-based compensation plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture LIBOR London Interbank Offered Rate (LIBOR) Member [Member] London Interbank Offered Rate (LIBOR) Member Triggering Event [Axis] Triggering Event [Axis] Triggering Event Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Line of Credit Line of Credit [Member] Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Cash proceeds to sponsors, ratio to invested capital Cash Proceeds to Sponsors, Ratio to Invested Capital Cash Proceeds to Sponsors, Ratio to Invested Capital Segment Reporting [Abstract] Post-retirement obligations Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Entity Central Index Key Entity Central Index Key Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-Lived Intangible Assets by Major Class [Table] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Business optimization expenses Other Restructuring Costs Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Segment Information Segment Reporting Disclosure [Text Block] Current portion of long-term debt Less current portion Long-Term Debt, Current Maturities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Recent Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Restricted Stock Restricted Stock [Member] Entity Shell Company Entity Shell Company Measurement Basis [Axis] Measurement Basis [Axis] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title Statement [Table] Statement [Table] Prepaid software licensing Prepaid Software Licensing, Current Prepaid Software Licensing, Current Consolidation Items [Domain] Consolidation Items [Domain] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Stock supplies Prepaid Supplies Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total capital expenditures Payments to Acquire Productive Assets Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Level 1 Fair Value, Inputs, Level 1 [Member] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total current assets Assets, Current Statement of Cash Flows [Abstract] GEORGIA GEORGIA Senior Notes Senior Notes [Member] Accrued liabilities Increase (Decrease) in Accrued Liabilities 2027 Long-Term Debt, Maturity, Year Three Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Long-term debt Long-term debt Long-Term Debt, Excluding Current Maturities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Ethylene Oxide Tort Litigation - Illinois Ethylene Oxide Tort Litigation - Illinois [Member] Ethylene Oxide Tort Litigation - Illinois Weighted-average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other Other Intangible Assets [Member] Income Taxes Income Tax Disclosure [Text Block] Earnings (loss) per share: Earnings Per Share [Abstract] Equity [Abstract] Restricted Stock - Pre- IPO B-2 Pre-IPO B-2 [Member] Pre-IPO B-2 Retained deficit Retained Earnings (Accumulated Deficit) Class of Stock [Domain] Class of Stock [Domain] Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Inventories Increase (Decrease) in Inventories Soft call premium Debt Instrument, Soft Call Premium, Percent Debt Instrument, Soft Call Premium, Percent Amount awarded to other party Litigation Settlement, Amount Awarded to Other Party 2026 Long-Term Debt, Maturity, Year Two Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Earnings per Common Share: Earnings per Common Share [Abstract] Earnings per Common Share Accounting Changes and Error Corrections [Abstract] Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Current portion of long-term debt Long-Term Debt, Fair Value Carrying Amount Reported Value Measurement [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Entity Registrant Name Entity Registrant Name Point in time Transferred at Point in Time [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Depreciation and amortization Depreciation, Depletion and Amortization Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Gross profit Gross Profit Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Fair Value as of Grant Date Award Grant Date Fair Value Customer Concentration Risk Customer Concentration Risk [Member] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Post-retirement assets Assets for Plan Benefits, Defined Benefit Plan 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 Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Level 2 Fair Value, Inputs, Level 2 [Member] Long-term debt Debt Issuance Costs, Net Long-Term Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Finite-lived intangible assets, remaining amortization period Finite-Lived Intangible Assets, Remaining Amortization Period Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Geographical [Domain] Geographical [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Face amount Debt Instrument, Face Amount Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Principles of Consolidation Consolidation, Policy [Policy Text Block] Interest rate swaps Interest rate swap Interest Rate Swap [Member] Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Defense incurred costs Gross Settlement And Defense Costs Incurred Gross Settlement And Defense Costs Incurred Common stock, with $0.01 par value, 1,200,000 shares authorized; 286,037 shares issued at September 30, 2024 and December 31, 2023 Common Stock, Value, Issued Share-Based Payment Arrangement [Abstract] Weighted average interest rate Debt Instrument, Interest Rate During Period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Litigation Status [Axis] Litigation Status [Axis] Other investing activities Payments for (Proceeds from) Other Investing Activities Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Financing activities: Net Cash Provided by (Used in) Financing Activities [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] Preferred stock, with $0.01 par value, 120,000 authorized; no shares issued at September 30, 2024 and December 31, 2023 Preferred Stock, Value, Issued Finished goods Inventory, Finished Goods, Gross Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Fair Value Measurement [Domain] Fair Value Measurement [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 Customer One Customer One [Member] Customer One Accounts payable Increase (Decrease) in Accounts Payable 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 Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Property, plant, and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Purchases of property, plant and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Goodwill [Table] Goodwill [Table] Derivatives designated as hedging instruments Derivatives designated as hedging instruments Designated as Hedging Instrument [Member] Nelson Labs Nelson Labs [Member] Nelson Labs Embedded derivatives Embedded Derivative Assets and Liabilities Embedded Derivative Financial Instruments [Member] Gain Contingencies [Line Items] Gain Contingencies [Line Items] Net income (loss) attributable to Sotera Health Company common shareholders Net Income (Loss) Available to Common Stockholders, Basic Redemption price, as percent of principal, proceeds from equity offerings Debt Instrument Redemption Price Percentage, Proceeds From Equity Offerings Debt Instrument Redemption Price Percentage, Proceeds From Equity Offerings Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total current liabilities Liabilities, Current 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] Total assets Assets 2025 Finite-Lived Intangible Asset, Expected Amortization, Year One Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Schedule of Acquired Finite-Lived Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Income taxes receivable Income Taxes Receivable, Current Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Noncurrent liabilities Other Liabilities, Noncurrent Customer Three Customer Three [Member] Customer Three Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount See Commitments and contingencies note Commitments and Contingencies Options vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period Termination Date Trading Arrangement Termination Date Gain Contingencies [Table] Gain Contingencies [Table] Insurance accrual Accrued Insurance, Current 2025 Long-Term Debt, Maturity, Year One Share-Based Compensation Share-Based Payment Arrangement [Text Block] Accrued utilities Accrued Utilities, Current Derivatives not designated as hedging instruments Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] Entity Address, City or Town Entity Address, City or Town Proceeds from long-term borrowings Proceeds from Issuance of Long-Term Debt Debt Instrument [Axis] Debt Instrument [Axis] Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Share-based compensation expense Share-Based Payment Arrangement, Expense Net income (loss) Net (loss) income Consolidated income before taxes Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Long-term debt Long Term Debt Gross Noncurrent Long Term Debt Gross Noncurrent Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Interest rate derivatives (net of taxes of $(1,399), $(934), $(2,110) and $(3,294), respectively) Interest rate derivatives, net of tax Interest rate derivatives, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Revenue Recognition Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Other Other Accrued Liabilities, Current Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Number of cases to be stayed (in cases) Number Of Cases To Be Stayed Number Of Cases To Be Stayed Base amount for default Debt Instrument, Base Amount For Default Debt Instrument, Base Amount For Default Current portion of finance lease obligations Finance Lease, Liability, Current Other Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Alternative Base Rate Base Rate [Member] Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Insider Trading Arrangements [Line Items] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Inventory Disclosure [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Other current assets Increase (Decrease) in Other Current Assets PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Total cost of revenues Cost of Revenue Land-use rights Land-Use Rights [Member] Land-Use Rights Adjustment to Compensation: Adjustment to Compensation [Axis] Prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Foreign currency forward contracts Foreign Exchange Contract [Member] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Sterigenics Sterigenics [Member] Sterigenics Litigation Case [Domain] Litigation Case [Domain] Customer [Domain] Customer [Domain] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings / (Accumulated Deficit) Retained Earnings [Member] Embedded derivatives Embedded Derivative, Fair Value of Embedded Derivative Asset Amortization of debt issuance costs Amortization of Debt Issuance Costs Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Litigation Status [Domain] Litigation Status [Domain] Litigation settlement Professional services relating to EO sterilization facilities Litigation Settlement, Fee Expense Basic (in shares) Weighted-average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Loss contingency, insurance limits per occurrence Loss Contingency, Undiscounted Amount Of Insurance-Related Assessment Liability Per Occurrence Loss Contingency, Undiscounted Amount Of Insurance-Related Assessment Liability Per Occurrence Georgia EO litigation settlement Litigation Settlement, Nonoperating Expense Litigation Settlement, Nonoperating Expense Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest RSUs Restricted Stock Units (RSUs) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Professional fees Accrued Professional Fees, Current Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Triggering period for default Debt Instrument, Triggering Period For Default Debt Instrument, Triggering Period For Default Entity Filer Category Entity Filer Category Amortization rate Debt Instrument, Amortization Rate Debt Instrument, Amortization Rate Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Cost of revenues: Cost of Revenue [Abstract] Company Selected Measure Name Company Selected Measure Name