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Cover Page
Mar. 30, 2021
Cover [Abstract]  
Document Type 8-K
Document Period End Date Mar. 30, 2021
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Amendment Flag false
Entity Information [Line Items]  
Entity File Number 001-09057
Entity Registrant Name WEC ENERGY GROUP, INC.
Entity Tax Identification Number 39-1391525
Entity Incorporation, State or Country Code WI
Entity Address, Address Line One 231 West Michigan Street
Entity Address, Address Line Two P.O. Box 1331
Entity Address, City or Town Milwaukee
Entity Address, State or Province WI
Entity Address, Postal Zip Code 53201
City Area Code 414
Local Phone Number 221-2345
Title of 12(b) Security Common Stock, $.01 Par Value
Trading Symbol WEC
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0000783325
Wisconsin Electric Power Company  
Entity Information [Line Items]  
Entity File Number 001-01245
Entity Registrant Name WISCONSIN ELECTRIC POWER COMPANY
Entity Tax Identification Number 39-0476280
Entity Incorporation, State or Country Code WI
Entity Address, Address Line One 231 West Michigan Street
Entity Address, Address Line Two P.O. Box 2046
Entity Address, City or Town Milwaukee
Entity Address, State or Province WI
Entity Address, Postal Zip Code 53201
City Area Code 414
Local Phone Number 221-2345
Entity Central Index Key 0000107815
Wisconsin Public Service Corporation  
Entity Information [Line Items]  
Entity File Number 001-03016
Entity Registrant Name WISCONSIN PUBLIC SERVICE CORPORATION
Entity Tax Identification Number 39-0715160
Entity Incorporation, State or Country Code WI
Entity Address, Address Line One 2830 South Ashland Avenue
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
Entity Central Index Key 0000107833