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Regulatory Matters	3 Months Ended
Regulatory Matters	Mar. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Matters	Regulatory Matters NIPSCO change in accounting estimate As part of the NIPSCO Gas Settlement and Stipulation Agreement filed on March 2, 2022, NIPSCO Gas has agreed to change the depreciation methodology for its calculation of deprecation rates, which will reduce depreciation expense and subsequent revenues and cash flows once new rates become effective, subject to approval by the IURC. Columbia of Ohio regulatory filing update On Wednesday, April 6, 2022, the PUCO Staff issued its Staff Report in Columbia of Ohio's base rate case, filed on June 21, 2021, which was filed in conjunction with applications for an alternative rate plan, approval of certain deferral authority, and updates to certain riders. Columbia of Ohio's application requested a rate increase approximating a 21.3% or $221.4 million increase in revenue per year. The Staff Report recommended a rate increase of 4.0% - 6.3% or $35.2 million to $57.6 million increase in revenue per year. The Staff recommended adjustments include, but are not limited to, plant assets, COVID-19 deferrals and environmental remediation costs. We are currently reviewing the Staff's recommendations and will file our written objections to the Staff report on May 6, 2022. Regulatory deferral related to renewable energy investments In accordance with the accounting principles of ASC 980, we recognize a regulatory liability or asset for amounts representing the timing difference between the profit earned from the joint ventures and the amount included in regulated rates to recover our approved investments in consolidated joint ventures. The amounts recorded in income will ultimately reflect the amount allowed in regulated rates to recover our investments over the useful life of the projects. The offset to the regulatory liability or asset associated with our renewable investments included in regulated rates is recorded in "Depreciation expense" on the Condensed Statements of Consolidated Income (unaudited). We recorded a credit to depreciation expense in the amount of $2.9 million and zero for the three months ended March 31, 2022 and March 31, 2021, respectively, related to the regulatory deferral of income (loss) associated with our joint ventures, which is not included in current rates.