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Interests To Be Acquired Basic (in shares) Weighted-average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Unnamed E-Beam Joint Venture Unnamed E-Beam Joint Venture [Member] Unnamed E-Beam Joint Venture Ownership percentage Equity Method Investment, Ownership Percentage Share-based compensation expense Share-Based Payment Arrangement, Expense See Commitments and contingencies note Commitments and Contingencies Security Exchange Name Security Exchange Name Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Return on investment Return On Investment Return On Investment Notional amount Notional Amount Derivative, Notional Amount Preferred stock, with $0.01 par value, 120,000 authorized; no shares issued at June 30, 2022 and December 31, 2021, respectively Preferred Stock, Value, Issued Letters of credit outstanding, amount Letters of Credit Outstanding, Amount Restricted cash short-term Restricted Cash, Current Segment Reconciling Items Segment Reconciling Items [Member] Restricted Stock Restricted Stock [Member] Total net revenues Segment revenues Revenue from Contract with Customer, Excluding Assessed Tax Income taxes payable / receivable Increase (Decrease) in Income Taxes Payable Service cost Defined Benefit Plan, Service Cost Cover [Abstract] Pending Litigation Pending Litigation [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Share-Based Compensation Share-Based Payment Arrangement [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Cash acquired Cash Acquired from Acquisition Noncontrolling Interests Noncontrolling Interest [Member] Amortization of net actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Total liabilities and equity Liabilities and Equity Unrealized foreign exchange losses Foreign Currency Transaction Gain (Loss), Unrealized Eurodollar Eurodollar [Member] Amortization of debt issuance costs Amortization of Debt Issuance Costs Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Goodwill [Roll Forward] Goodwill [Roll Forward] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Derivatives Not Designated in Hedge Relationships Not Designated as Hedging Instrument [Member] Purchase of BioScience Laboratories, LLC, net of cash acquired Payments to acquire businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Level 2 Fair Value, Inputs, Level 2 [Member] Customer One Customer One [Member] Customer One Current Fiscal Year End Date Current Fiscal Year End Date Sealed source and supply agreements Sealed Source And Supply Agreements [Member] Sealed Source And Supply Agreements Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Prepaid maintenance contracts Prepaid Maintenance Contracts, Current Prepaid Maintenance Contracts, Current Current portion of asset retirement obligations Asset Retirement Obligation, Current Net income attributable to Sotera Health Company common shareholders Net Income (Loss) Available to Common Stockholders, Diluted Vesting [Axis] Vesting [Axis] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Diluted (in dollars per share) Net income per common share attributable to Sotera Health Company common shareholders - diluted (in dollars per share) Earnings Per Share, Diluted Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Year Two Share-Based Payment Arrangement, Tranche Two [Member] Term Loan Term Loan [Member] Term Loan Trade names / trademarks Trademarks and Trade Names [Member] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Accretion of asset retirement obligations Asset Retirement Obligation, Accretion Expense Ownership percentage by parent Noncontrolling Interest, Ownership Percentage by Parent Nelson Labs Nelson Labs [Member] Nelson Labs Share-based compensation plans APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Total current liabilities Liabilities, Current Options vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares Other Other Assets, Current Customer Concentration Risk Customer Concentration Risk [Member] COVID-19 expenses Cost And Expenses, COVID-19 Cost And Expenses, COVID-19 Customer Three Customer Three [Member] Customer Three Contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Fair Value, Derivative Asset Derivative asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One Total cost of revenues Cost of Revenue Other financing activities Proceeds from (Payments for) Other Financing Activities Purchase of mandatorily redeemable noncontrolling interest in Nelson Laboratories Fairfield, Inc. Payments to Acquire Additional Interest in Subsidiaries Product and Service [Axis] Product and Service [Axis] Class of Stock [Domain] Class of Stock [Domain] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Cash acquired Cash Acquired in Excess of Payments to Acquire Business Post-retirement obligations Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Interest expense, net Interest Expense Derivative Instruments and Hedging Activities Disclosure [Abstract] Trade names Trade Names [Member] Variable rate Derivative, Variable Interest Rate Credit Facility [Axis] Credit Facility [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Inventories Inventory Disclosure [Text Block] Equity [Abstract] Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Inventory Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Entity Tax Identification Number Entity Tax Identification Number Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Impairment of investment in unconsolidated affiliate Impairment of investment in unconsolidated affiliate Equity Method Investment, Other than Temporary Impairment Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Number of subsidiaries with non-controlling interest Number Of Subsidiaries With Non-Controlling Interest Number Of Subsidiaries With Non-Controlling Interest Revenue from Contract with Customer [Abstract] For the remainder of 2022 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Customer contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Weighted average interest rate Debt Instrument, Interest Rate During Period Professional services relating to EO sterilization facilities Litigation Settlement, Expense Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-Lived Intangible Assets by Major Class [Table] Net increase in cash and cash equivalents, including restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Dilutive effect of potential common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Entity Central Index Key Entity Central Index Key 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] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Purchase price Business Combination, Consideration Transferred Gain Contingencies [Line Items] Gain Contingencies [Line Items] Other Other Accrued Liabilities, Current Land-use rights Land-Use Rights [Member] Land-Use Rights City Area Code City Area Code Professional fees Accrued Professional Fees, Current Assets Assets [Abstract] Other current assets Increase (Decrease) in Other Current Assets Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Sterigenics Sterigenics [Member] Sterigenics Statement of Stockholders' Equity [Abstract] Financial instruments subject to mandatory redemption Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Schedule of Deferred Costs, Capitalized, Prepaid, and Other Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] 2023 Long-Term Debt, Maturity, Year One Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Variable Rate [Axis] Variable Rate [Axis] 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 Noncurrent liabilities Other Liabilities, Noncurrent Stock supplies Prepaid Supplies Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] China Subsidiaries China Subsidiaries [Member] China Subsidiaries 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Cost of Revenue Cost of Sales [Member] Percent of consideration transferred on acquisition date Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent, Percent of Consideration Transferred on Acquisition Date Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent, Percent of Consideration Transferred on Acquisition Date Customer [Domain] Customer [Domain] Other benefits plans Other Postretirement Benefits Plan [Member]