| Cover | Nov. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 10, 2021 |
| Entity File Number | 1-3016 |
| Entity Registrant Name | WISCONSIN PUBLIC SERVICE CORPORATION |
| Entity Central Index Key | 0000107833 |
| Entity Tax Identification Number | 39-0715160 |
| Entity Incorporation, State or Country Code | WI |
| Entity Address, Address Line One | 700 North Adams Street |
| Entity Address, Address Line Two | P.O. Box 19001 |
| Entity Address, City or Town | Green Bay |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 54307-9001 |
| City Area Code | 800 |
| Local Phone Number | 450-7260 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
