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Goodwill (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill	$ 1,485.9	$ 1,485.9
NIPSCO Operations
Goodwill [Line Items]
Goodwill	17.8
Columbia Operations
Goodwill [Line Items]
Goodwill	1,468.1
Corporate and Other
Goodwill [Line Items]
Goodwill	$ 0.0

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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