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Schedule I Statement of Comprehensive Income - Taxes (Details) - WEC Energy Group - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statements of comprehensive income |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 1,303.9 | $ 1,197.2 | $ 1,132.5
Cash flow hedges |  |  |
Statements of comprehensive income |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | $ 0.2 | $ (1.6) | $ (1.3)

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