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Risk Management Activities (Narrative) (Details) mMDth in Millions, $ in Millions		6 Months Ended	12 Months Ended
	Jun. 07, 2022 USD ($)	Jun. 30, 2022 USD ($) mMDth	Dec. 31, 2021 USD ($) mMDth
Derivative [Line Items]
Limit of GCA Volumes		20.00%
Derivative, Gain (Loss) on Derivative, Net	$ 10.2
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 0.0	$ 0.0
Minimum
Derivative [Line Items]
Commodity Contract Length		1 year
Maximum
Derivative [Line Items]
Commodity Contract Length		5 years
Senior Notes | NiSource
Derivative [Line Items]
Senior Notes	$ 350.0
Debt, Weighted Average Interest Rate	5.00%
Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount	$ 250.0	$ 250.0
Natural Gas
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | mMDth		112.3	124.5

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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