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Short-Term Borrowings	9 Months Ended
Short-Term Borrowings	Sep. 30, 2025
Short-Term Debt [Abstract]
Short-Term Borrowings	Short-Term Borrowings We generate short-term borrowings from our revolving credit facility, commercial paper program, and accounts receivable transfer programs. Each of these borrowing sources is described further below. Revolving Credit Facility. We maintain a revolving credit facility to fund ongoing working capital requirements, including the provision of liquidity support for our commercial paper program, the issuance of letters of credit and general corporate purposes. Our revolving credit facility has a program limit of $1.85 billion and is comprised of a syndicate of banks. We had no outstanding borrowings under this facility as of September 30, 2025 and December 31, 2024. Commercial Paper Program. Our commercial paper program has a program limit of $1.85 billion. We had $1,060.0 million and $604.6 million of commercial paper outstanding with weighted-average interest rates of 4.40% and 4.73% as of September 30, 2025 and December 31, 2024, respectively. Accounts Receivable Transfer Programs. Columbia of Ohio, NIPSCO, and Columbia of Pennsylvania each maintain a receivables agreement whereby they transfer their customer accounts receivables to third-party financial institutions through consolidated special purpose entities. The three agreements expire between May 2026 and October 2026 and may be further extended if mutually agreed to by the parties thereto. All receivables transferred to third parties are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables transferred is determined in part by required loss reserves under the agreements. Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term borrowings on the Condensed Consolidated Balance Sheets (unaudited). As of September 30, 2025, the maximum amount of debt that could be borrowed related to our accounts receivable programs was $245.0 million. We had $200.0 million and no short-term borrowings related to the securitization transactions as of September 30, 2025 and December 31, 2024, respectively. For the nine months ended September 30, 2025 and 2024, $200.0 million and $(337.6) million, respectively, were recorded as cash flows from (used for) financing activities related to the change in short-term borrowings due to securitization transactions. Columbia of Ohio, NIPSCO and Columbia of Pennsylvania remain responsible for collecting on the receivables securitized, and the receivables cannot be transferred to another party. Items listed above are presented net in the Condensed Statements of Consolidated Cash Flows (unaudited) as their maturities are less than 90 days.