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Derivative Instruments - Cash Flow Hedges (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 15, 2021 USD ($) number_of_interest_rate_swaps
Derivative instruments |  |  |  |
Total interest expense line item on the income statements | $ 515.1 | $ 471.1 | $ 493.7 |
WEC Energy Group |  |  |  |
Derivative instruments |  |  |  |
Total interest expense line item on the income statements | 109.6 | 70.2 | 96.9 |
WEC Energy Group | WEC Energy Group 2007 junior notes due 2067 |  |  |  |
Derivative instruments |  |  |  |
Long-term debt outstanding | 500.0 | 500.0 |  | $ 500.0
Interest rate swaps | WEC Energy Group |  |  |  |
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%
Derivative gain (loss) recognized in other comprehensive income / loss | 0.0 | 0.8 | (5.9) |
Net derivative gain (loss) reclassified from accumulated other comprehensive loss to interest expense | 0.4 | $ (1.3) | $ (2.1) |
Reclassification to interest expense within next twelve months | $ 0.4 |  |  |

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