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Property, Plant, and Equipment	3 Months Ended
Property, Plant, and Equipment	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure	Property, Plant and Equipment In 2020, MISO approved NIPSCO's plan to retire the R.M. Schahfer Generating Station Units 14, 15, 17 and 18 in 2023. The December 2019 NIPSCO electric rate case order included approval to create a regulatory asset upon the retirement of the R.M. Schahfer Generating Station. The order allows for the recovery of, and on, the net book value of the station by the end of 2032. On March 11, 2021, NIPSCO submitted separate Attachment Y Notices for Units 14 and 15 seeking a suspension date of October 1, 2021 for both coal fired units at R.M. Schahfer Generating Station. On May 28, 2021, NIPSCO received approval from MISO to suspend and retire these two units on October 1, 2021. The remaining two units are still scheduled to be retired in 2023. In connection with MISO's approvals of NIPSCO's planned retirement of the R.M. Schahfer Generating Station, we recorded plant retirement-related charges of zero and $4.6 million for the three and nine months ended September 30, 2020, respectively, comprised of write downs of certain capital projects that have been cancelled and materials and supplies inventory balances deemed obsolete due to the planned retirement. As a result of the accelerated retirements of Units 14 and 15, we recorded severance charges and wrote down additional obsolete inventory. These charges totaled $3.6 million and $12.2 million for the three and nine months ended September 30, 2021, respectively. These charges are presented within "Operation and maintenance" on the Condensed Statements of Consolidated Income (Loss). At retirement, the net book value of each retired unit will be reclassified from "Net Property, Plant and Equipment," to current and long-term ''Regulatory Assets.'' The total net book value of R.M. Schahfer Generating Station's four coal units and other associated plant estimated to be retired was $831.8 million at September 30, 2021. Refer to Note 19, "Subsequent Event," for additional information. On April 28, 2021, in response to a Motion filed by certain parties in NIPSCO's quarterly FAC proceeding, the IURC created a sub-docket proceeding in order to receive additional information related to the retirements of Units 14 and 15 on October 1, 2021 and any resulting cost impacts to customers.