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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Revolving credit facilities |  |
Short-term credit capacity | $ 2,800.0 |
Letters of credit issued inside credit facilities | 2.5 |
Commercial paper outstanding | 686.4 | $ 1,440.1
Available capacity under existing credit facility | 2,111.1 |
Commercial paper |  |
Revolving credit facilities |  |
Commercial paper outstanding | 686.4 | $ 1,440.1
WEC Energy Group | Credit facility maturing October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | 1,200.0 |
WE | Credit facility maturing October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | 500.0 |
WPS | Credit facility maturing October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | 400.0 |
WG | Credit facility maturing October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | 350.0 |
PGL | Credit facility maturing October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | $ 350.0 |

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