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DERIVATIVE INSTRUMENTS - CASH FLOW HEDGES (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Nov. 15, 2021 USD ($) number_of_interest_rate_swaps
Derivative instruments |  |  |  |  |
Interest expense | $ 127.5 | $ 118.0 | $ 364.9 | $ 357.5 |
WEC Energy Group | WEC Energy Group's junior subordinated notes due in 2067 |  |  |  |  |
Derivative instruments |  |  |  |  |
Long-term debt outstanding |  |  |  |  | $ 500.0
WEC Energy Group | Interest rate swaps |  |  |  |  |
Derivative instruments |  |  |  |  |
Number of interest rate swaps | number_of_interest_rate_swaps |  |  |  |  | 2
Interest rate swap notional value |  |  |  |  | $ 250.0
Interest rate swap fixed interest rate |  |  |  |  | 4.9765%
Net derivative gain (loss) reclassified from accumulated other comprehensive loss to interest expense | 0.1 | $ (1.4) | 0.3 | $ (4.1) |
Amount to be reclassified from accumulated other comprehensive loss to interest expense | $ 0.4 |  | $ 0.4 |  |

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