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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

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