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LONG-TERM DEBT (Details) - USD ($) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Nov. 01, 2019 | Oct. 24, 2019 | Sep. 30, 2019
WEC Energy Group | WEC Senior Notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt |  |  | $ 350.0
Debt instrument stated interest rate percentage |  |  | 3.10%
WPS | WPS Senior Notes due 2049 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt |  |  | $ 300.0
Debt instrument stated interest rate percentage |  |  | 3.30%
UMERC | UMERC Senior Notes due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt |  |  | $ 160.0
Debt instrument stated interest rate percentage |  |  | 3.26%
ATC Holding LLC | ATC Holding Senior Notes due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt |  |  | $ 235.0
Debt instrument stated interest rate percentage |  |  | 3.75%
PGL | PGL Series GGG due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt |  |  | $ 275.0
Debt instrument stated interest rate percentage |  |  | 2.96%
PGL | PGL Series UU due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Debt |  |  | $ 75.0
Debt instrument stated interest rate percentage |  |  | 4.63%
Subsequent event | PGL | PGL Series HHH due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt | $ 75.0 |  |
Debt instrument stated interest rate percentage | 2.64% |  |
Subsequent event | PGL | PGL Series III due 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt | $ 50.0 |  |
Debt instrument stated interest rate percentage | 3.06% |  |
Subsequent event | WG | WG Debentures due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Debt |  | $ 150.0 |
Debt instrument stated interest rate percentage |  | 2.38% |

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