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(RCA) Regulatory Compliance Associates Inc. (RCA) [Member] Regulatory Compliance Associates Inc. 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Amortization Period Basic (in dollars per share) Net income per common share attributable to Sotera Health Company common shareholders - basic (in dollars per share) Earnings Per Share, Basic Interest rate derivatives (net of taxes of $1,036, $1,241, $(2,360) and $3,350, respectively) Interest rate derivatives, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Operating lease assets Operating Lease, Right-of-Use Asset Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accounting Policies [Abstract] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Prepaid software licensing Prepaid Software Licensing, Current Prepaid Software Licensing, Current Number of claims scheduled for trials Loss Contingency, Claims Scheduled For Trials, Number Loss Contingency, 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(Iotron) [Member] Iotron Industries Canada, Inc. 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Eligible Non-Settling Claimants Number of instruments held Derivative, Number of Instruments Held Diluted (in shares) Weighted-average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Less current portion Debt Instrument, Unamortized Discount, Current Interest expense, net Interest Income (Expense), Nonoperating, Net Operating expenses: Operating Expenses [Abstract] Revenue Recognition Revenue from Contract with Customer [Text Block] Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount 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 Additional Paid-In Capital Additional Paid-in Capital [Member] 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Disclosure [Text Block] Net increase (decrease) in cash and cash equivalents, including restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Secured Debt Secured Debt [Member] Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Current portion of finance lease obligations Finance Lease, Liability, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Land-use rights Land-Use Rights [Member] Land-Use Rights Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Scenario [Axis] Scenario [Axis] Debt Instrument [Line Items] Debt Instrument [Line Items] Basic (in shares) Weighted-average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status 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