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Variable Interest Entities (Narrative) (Details)				12 Months Ended
	Sep. 18, 2024 USD ($)	May 24, 2024 USD ($)	Mar. 18, 2024 USD ($)	Dec. 31, 2024 USD ($) Rate MW	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 17, 2023 Rate
Variable Interest Entity [Line Items]
Wind Power Purchase Agreement, Purchase Percentage | Rate				100.00%
Milestone and final payments to renewable generation asset developer				$ 482,000,000.0	$ 761,400,000	$ 323,900,000
Income Taxes				158,100,000	139,500,000	$ 164,600,000
Payments to Acquire Assets, Investing Activities	$ 153,300,000	$ 114,900,000	$ 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
Proceeds from (Payments to) Noncontrolling Interests				$ 50,300,000	2,170,700,000
NIPSCO Holdings II
Variable Interest Entity [Line Items]
Subsidiary, Ownership Percentage, Parent | Rate							19.90%
NiSource
Variable Interest Entity [Line Items]
Subsidiary, Ownership Percentage, Parent				80.10%
Rosewater
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				102
Indiana Crossroads Wind
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				302
Indiana Crossroads Solar
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				200
Dunns Bridge I
Variable Interest Entity [Line Items]
Nameplate Capacity | MW				265
Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Income Taxes					$ 63,500,000

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