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Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Gain Contingencies [Line Items] Gain Contingencies [Line Items] Loss on refinancing of debt Gain (Loss) On Refinancing Of Debt Gain (Loss) On Refinancing Of Debt Accounts payable Increase (Decrease) in Accounts Payable SOFR Secured Overnight Financing Rate (SOFR) [Member] Customer contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Interest expense, net Interest expense, net Interest Income (Expense), Nonoperating Goodwill [Line Items] Goodwill [Line Items] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Term loan due 2031 Term Loan B, Due 2026 [Member] Term Loan B, Due 2026 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 Adjustment to Compensation: Adjustment to 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[Member] Principles of Consolidation Consolidation, Policy [Policy Text Block] Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Stock Options Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Prepaid taxes Prepaid Taxes Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total equity Beginning balance Ending balance Equity, Attributable to Parent Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Share-based compensation Share-Based Payment Arrangement, Expense Common stock, shares authorized (in shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Nordion Nordion [Member] Nordion Current assets: Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Defined Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Regulatory licenses and other Licensing Agreements [Member] Liabilities and equity Liabilities and Equity [Abstract] Gain Contingencies [Table] Gain Contingencies [Table] Cover [Abstract] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Senior Secured Credit Facilities Senior Secured Credit Facilities [Member] Senior Secured Credit Facilities Portion at Fair Value Measurement 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Redemption as percent of outstanding principal amount Debt Instrument, Redemption As Percent Of Outstanding Principal Amount Debt Instrument, Redemption As Percent Of Outstanding Principal Amount Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Year Four Share-based Payment Arrangement, Tranche Four [Member] Share-based Payment Arrangement, Tranche Four Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Personal Injury And Wrongful Death Personal Injury And Wrongful Death [Member] Personal Injury And Wrongful Death Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity 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Current portion of long-term debt Less current portion Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Name Measure Name Letter of Credit Letter of Credit [Member] Secured Debt Secured Debt [Member] Current portion of operating lease obligations Operating Lease, Liability, Current Number of cases including personal injury and property claims (in cases) Number Of Cases Including Personal Injury and Property Claims Number Of Cases Including Personal Injury and Property Claims Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type [Axis] Award Type [Axis] Foreign Currency Translation Accumulated Foreign Currency Adjustment 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Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Reserve for excess and obsolete inventory Inventory Adjustments Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Concentration Risk Type [Axis] Concentration Risk Type [Axis] Inventories Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount RSUs RSUs Restricted Stock Units (RSUs) [Member] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Triggering Event [Domain] Triggering Event [Domain] Triggering Event [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Long-term debt Debt Issuance Costs, Net Insurance accrual Accrued Insurance, Current Realized gain on interest rate derivatives recorded in interest expense, net Derivative, Gain (Loss) on Derivative, Net Increase in borrowing capacity Line Of Credit Facility, Increase In Borrowing Capacity Line Of Credit Facility, Increase In Borrowing Capacity Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Gross Carrying Amount Indefinite-Lived Intangible Assets (Excluding Goodwill) 2020 Omnibus Incentive Plan 2020 Omnibus Incentive Plan [Member] 2020 Omnibus Incentive Plan Basis of Presentation Basis of Accounting [Text Block] Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Acquired Indefinite-lived Intangible Assets [Line Items] Intangible Asset, Acquired, Indefinite-Lived [Line Items] Asset Transfer Case Asset Transfer Case [Member] Asset Transfer Case Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Actual funding requirements, period Defined Benefit Plan, Annual Funding Requirements, Period Defined Benefit Plan, Annual Funding Requirements, Period Solvency payment as percent of market value Letters Of Credit, Solvency Payment As Percent Of Market Value Letters Of Credit, Solvency Payment As Percent Of Market Value Number of pending claims Loss Contingency, Pending Claims, Number Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] 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B-1 [Member] Pre-IPO B-1 Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption price, percentage Debt Instrument, Redemption Price, Percentage Illinois EO litigation settlements Litigation settlement Illinois EO litigation settlements Gain (Loss) from Litigation Settlement Accrued liabilities Accrued liabilities Accrued Liabilities, Current Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Renewal term Licensing Agreements, 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[Member] Forward Start Date Beginning on July 31, 2023 Plan Name [Domain] Plan Name [Domain] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Equity [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Weighted average remaining amortization period Finite-Lived Intangible Assets, Remaining Amortization Period Schedule of Goodwill [Table] Goodwill [Table] Unamortized discount, excluding current portion Debt Instrument, Unamortized Discount, Excluding Current Portion Debt Instrument, Unamortized Discount, Excluding Current Portion Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll 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[Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Deferred lease income Deferred Rent Credit, Noncurrent Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Finished goods Inventory, Finished Goods, Gross Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Unrealized (gain) loss on foreign currency forward contracts recorded in foreign exchange loss (gain) Unrealized Gain (Loss), Foreign Currency Transaction, after Tax 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for) Other Financing Activity Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Other Intangible Assets [Member] Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Embedded derivatives Embedded Derivative, Fair Value of Embedded Derivative Asset Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Face amount Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Pension and post-retirement benefits, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification 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