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Goodwill | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill Disclosure [Text Block] | Goodwill The following presents our goodwill balance allocated by segment as of June 30, 2025:
(in millions) |  | Columbia Operations |  | NIPSCO Operations |  | Corporate and Other |  | Total
Goodwill |  | $ | 1,468.1 |  |  | $ | 17.8 |  |  | $ | — |  |  | $ | 1,485.9 |

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