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GOODWILL AND INTANGIBLES - GOODWILL (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Goodwill balance by segment |  |
Changes to the carrying amount of goodwill |  | $ 0.0
Goodwill | $ 3,052.8 | 3,052.8
Accumulated impairment losses | 0.0 | 0.0
Goodwill impairment loss | 0.0 |
Wisconsin |  |
Goodwill balance by segment |  |
Goodwill | 2,104.3 | 2,104.3
Illinois |  |
Goodwill balance by segment |  |
Goodwill | 758.7 | 758.7
Other States |  |
Goodwill balance by segment |  |
Goodwill | 183.2 | 183.2
Non-Utility Energy Infrastructure |  |
Goodwill balance by segment |  |
Goodwill | $ 6.6 | $ 6.6

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