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Variable Interest Entities (Narrative) (Details)				3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 27, 2024 USD ($)	May 24, 2024 USD ($)	Mar. 18, 2024 USD ($)	Sep. 30, 2024 USD ($) Rate MW	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($) Rate MW	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items]
Wind Power Purchase Agreement, Purchase Percentage | Rate				100.00%				100.00%
Payments to Acquire Assets, Investing Activities	$ 153,300,000	$ 114.9	$ 110,600,000
Business Acquisition, Transaction Costs										$ 54,700,000
Proceeds from Contributed Capital							$ 2,160,000,000
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount										$ 1,360,000,000
Income Taxes				$ 15,900,000	$ 63,500,000	$ 3,800,000		$ 109,500,000	$ 103,700,000
Contributions from NIPSCO minority interest holders				39,800,000				99,500,000
Contributions from NIPSCO minority interest holders				$ 11,800,000				$ 32,000,000
Rosewater
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				102				102
Indiana Crossroads Wind
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				302				302
Indiana Crossroads Solar
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				200				200
Dunns Bridge I
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				265				265

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