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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Revolving credit facilities |  |
Short-term credit capacity | $ 3,100.0 |
Available capacity under existing credit facility | 1,589.3 |
Commercial paper |  |
Revolving credit facilities |  |
Commercial paper outstanding | 1,508.4 | $ 1,436.9
Letter of credit |  |
Revolving credit facilities |  |
Letters of credit issued inside credit facilities | 2.3 |
WE | Credit facility maturing in September 2026 |  |
Revolving credit facilities |  |
Short-term credit capacity | 500.0 |
WPS | Credit facility maturing in October 2022 |  |
Revolving credit facilities |  |
Short-term credit capacity | 400.0 |
WG | Credit facility maturing in September 2026 |  |
Revolving credit facilities |  |
Short-term credit capacity | 350.0 |
PGL | Credit facility maturing in September 2026 |  |
Revolving credit facilities |  |
Short-term credit capacity | 350.0 |
WEC Energy Group | Credit facility maturing in September 2026 |  |
Revolving credit facilities |  |
Short-term credit capacity | $ 1,500.0 |

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