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DERIVATIVE INSTRUMENTS - CASH FLOW HEDGES (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) number_of_interest_rate_swaps | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) number_of_interest_rate_swaps | Sep. 30, 2020 USD ($)
Derivative instruments |  |  |  |
Interest expense | $ 118.0 | $ 122.0 | $ 357.5 | $ 375.8
WEC Energy Group | WEC Energy Group's junior subordinated notes due in 2067 |  |  |  |
Derivative instruments |  |  |  |
Long-term debt outstanding | $ 500.0 |  | $ 500.0 |
WEC Energy Group | Interest rate swaps |  |  |  |
Derivative instruments |  |  |  |
Number of interest rate swaps | number_of_interest_rate_swaps | 2 |  | 2 |
Interest rate swap notional value | $ 250.0 |  | $ 250.0 |
Interest rate swap fixed interest rate | 4.9765% |  | 4.9765% |
Derivative loss recognized in other comprehensive loss | $ 0.0 | 0.0 | $ 0.0 | (5.8)
Net derivative loss reclassified from accumulated other comprehensive loss to interest expense | (1.4) | $ (1.3) | (4.1) | $ (2.0)
Amount to be reclassified from accumulated other comprehensive loss to interest expense | $ 0.4 |  | $ 0.4 |

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