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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding   33,289,327  
Documents Incorporated by Reference
Portions of Wisconsin Electric Power Company's Definitive information statement on Schedule 14C for its Annual Meeting of Shareholders, to be held on April 30, 2020, are incorporated by reference into Part III hereof.
    
Entity Central Index Key 0000107815    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Serial preferred stock, 3.60% Series      
Entity Information [Line Items]      
Title of 12(g) Security Serial Preferred Stock, 3.60% Series, $100 Par Value    
No Trading Symbol Flag true    
Six Per Cent. Preferred Stock      
Entity Information [Line Items]      
Title of 12(g) Security Six Per Cent. Preferred Stock, $100 Par Value    
No Trading Symbol Flag true