| Document and Entity Information | May 16, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Sotera Health Co |
| Amendment Flag | false |
| Entity Central Index Key | 0001822479 |
| Document Type | 8-K |
| Document Period End Date | May 16, 2022 |
| Entity Incorporation State 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 |
| Security 12b Title | Common stock, $0.01 par value per share |
| Trading Symbol | SHC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
