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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Revolving credit facilities |  |
Short-term credit capacity | $ 3,140.0 |
Letters of credit issued inside credit facilities | 2.3 |
Available capacity under existing credit facility | 2,310.5 |
Term loan |  |
Revolving credit facilities |  |
Term loan outstanding | 340.0 | $ 0.0
Commercial paper |  |
Revolving credit facilities |  |
Commercial paper outstanding | 487.2 | $ 830.8
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 |
WEC Energy Group | Term loan agreement maturing March 2021 |  |
Revolving credit facilities |  |
Short-term credit capacity | 340.0 |
WEC Energy Group | Credit facility maturing October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | $ 1,200.0 |

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