| Cover Page | Aug. 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 12, 2021 |
| Entity Registrant Name | SOTERA HEALTH COMPANY |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39729 |
| Entity Tax Identification Number | 47-3531161 |
| Entity Address, Address Line One | 9100 South Hills Blvd |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Broadview Heights |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 44147 |
| City Area Code | 440 |
| Local Phone Number | 262-1410 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $0.01 par value per share |
| Trading Symbol | SHC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001822479 |
| Amendment Flag | false |
