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Goodwill and Intangibles - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill |  |  |
Changes to the carrying amount of goodwill |  | $ 0.0 | $ 0.0
Goodwill |  | 3,052.8 | 3,052.8
Accumulated impairment losses |  | 0.0 |
Goodwill impairment loss | $ 0.0 |  |
Wisconsin |  |  |
Goodwill |  |  |
Goodwill |  | 2,104.3 | 2,104.3
Illinois |  |  |
Goodwill |  |  |
Goodwill |  | 758.7 | 758.7
Other States |  |  |
Goodwill |  |  |
Goodwill |  | 183.2 | 183.2
Non-Utility Energy Infrastructure |  |  |
Goodwill |  |  |
Goodwill |  | $ 6.6 | $ 6.6

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