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Derivative Instruments - Cash Flow Hedges (Details) - WEC Energy Group $ in Millions | Dec. 31, 2023 USD ($) | Aug. 15, 2023 USD ($) | Jul. 01, 2023 USD ($) | Dec. 31, 2022 USD ($) | Nov. 15, 2021 USD ($) number_of_interest_rate_swaps
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WEC Energy Group 2007 junior notes due 2067 |  |  |  |  |
Derivative instruments |  |  |  |  |
Long-term debt outstanding | $ 500.0 | $ 500.0 | $ 500.0 | $ 500.0 | $ 500.0
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%

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