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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Total preferred stock value issued $ 30.4 $ 30.4
WEC Energy Group | $.01 par value Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 0.01 $ 0.01
Shares authorized 15,000,000 15,000,000
Shares outstanding 0 0
Redemption price per share $ 0 $ 0
Total preferred stock value issued $ 0.0 $ 0.0
WE | $100 par value, Six Per Cent. Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 100 $ 100
Dividend rate (as a percent) 6.00% 6.00%
Shares authorized 45,000 45,000
Shares outstanding 44,498 44,498
Redemption price per share $ 0 $ 0
Total preferred stock value issued $ 4.4 $ 4.4
WE | $100 par value, Serial Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 100 $ 100
Shares authorized 2,286,500 2,286,500
WE | $100 par value, Serial Preferred Stock, 3.60% series    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 100 $ 100
Dividend rate (as a percent) 3.60% 3.60%
Shares outstanding 260,000 260,000
Redemption price per share $ 101 $ 101
Total preferred stock value issued $ 26.0 $ 26.0
WE | $25 par value, Serial Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 25 $ 25
Shares authorized 5,000,000 5,000,000
Shares outstanding 0 0
Redemption price per share $ 0 $ 0
Total preferred stock value issued $ 0.0 $ 0.0
WPS | $100 par value, Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 100 $ 100
Shares authorized 1,000,000 1,000,000
Shares outstanding 0 0
Redemption price per share $ 0 $ 0
Total preferred stock value issued $ 0.0 $ 0.0
PGL | $100 par value, Cumulative Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 100 $ 100
Shares authorized 430,000 430,000
Shares outstanding 0 0
Redemption price per share $ 0 $ 0
Total preferred stock value issued $ 0.0 $ 0.0
NSG | $100 par value, Cumulative Preferred Stock    
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Par or stated value per share $ 100 $ 100
Shares authorized 160,000 160,000
Shares outstanding 0 0
Redemption price per share $ 0 $ 0
Total preferred stock value issued $ 0.0 $ 0.0