v3.26.1
Investment in Master Trust - Fair Value and NAV (Details) - EBP 001
restriction in Thousands
Dec. 31, 2025
USD ($)
restriction
Dec. 31, 2024
USD ($)
Investments Measured at Net Asset Value Per Share | Common collective trust funds    
EBP, Master Trust [Line Items]    
Number of participant redemption restrictions | restriction 0  
Unfunded Commitment $ 0  
Master Trust    
EBP, Master Trust [Line Items]    
Investments at fair value 3,898,047,000 $ 3,494,890,000
Master Trust | WEC common stock    
EBP, Master Trust [Line Items]    
Investments at fair value 589,643,827 0
Master Trust | Mutual funds    
EBP, Master Trust [Line Items]    
Investments at fair value 387,841,000 1,346,121,000
Master Trust | Common collective trust funds    
EBP, Master Trust [Line Items]    
Investments at fair value 2,920,562,000 1,571,663,000
Master Trust | Level 1    
EBP, Master Trust [Line Items]    
Investments at fair value 977,485,000 1,923,227,000
Master Trust | Level 1 | WEC common stock    
EBP, Master Trust [Line Items]    
Investments at fair value 589,644,000 571,128,000
Master Trust | Level 1 | Money market mutual fund    
EBP, Master Trust [Line Items]    
Investments at fair value   5,978,000
Master Trust | Level 1 | Mutual funds    
EBP, Master Trust [Line Items]    
Investments at fair value 387,841,000 1,346,121,000
Master Trust | Level 2    
EBP, Master Trust [Line Items]    
Investments at fair value 0 0
Master Trust | Level 2 | WEC common stock    
EBP, Master Trust [Line Items]    
Investments at fair value 0 0
Master Trust | Level 2 | Money market mutual fund    
EBP, Master Trust [Line Items]    
Investments at fair value   0
Master Trust | Level 2 | Mutual funds    
EBP, Master Trust [Line Items]    
Investments at fair value 0 0
Master Trust | Level 3    
EBP, Master Trust [Line Items]    
Investments at fair value 0 0
Master Trust | Level 3 | WEC common stock    
EBP, Master Trust [Line Items]    
Investments at fair value 0 0
Master Trust | Level 3 | Money market mutual fund    
EBP, Master Trust [Line Items]    
Investments at fair value   0
Master Trust | Level 3 | Mutual funds    
EBP, Master Trust [Line Items]    
Investments at fair value 0 0
Master Trust | Level 1, Level 2, and Level 3    
EBP, Master Trust [Line Items]    
Investments at fair value 977,485,000 1,923,227,000
Master Trust | Level 1, Level 2, and Level 3 | WEC common stock    
EBP, Master Trust [Line Items]    
Investments at fair value 589,644,000 571,128,000
Master Trust | Level 1, Level 2, and Level 3 | Money market mutual fund    
EBP, Master Trust [Line Items]    
Investments at fair value   5,978,000
Master Trust | Level 1, Level 2, and Level 3 | Mutual funds    
EBP, Master Trust [Line Items]    
Investments at fair value 387,841,000 1,346,121,000
Master Trust | Investments Measured at Net Asset Value Per Share | Common collective trust funds    
EBP, Master Trust [Line Items]    
Investments at fair value $ 2,920,562,000 $ 1,571,663,000