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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Activities      
Net Income $ 844.7 $ 674.4 $ 791.8
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:      
Depreciation and amortization 1,043.2 908.2 820.8
Deferred income taxes 168.0 134.1 156.9
Stock compensation expense and 401(k) profit sharing contribution 43.6 33.5 24.9
Loss (gain) on sale of assets 2.9 2.9 (105.3)
Payments for assets retirement obligations (72.5) (41.6) (22.3)
Other adjustments (52.8) (17.9) 5.7
Changes in Assets and Liabilities:      
Accounts receivable (101.5) 184.1 (216.3)
Gas storage and other inventories 102.0 233.9 (258.9)
Accounts payable 71.5 (171.8) 165.0
Exchange gas receivable/payable (133.5) 126.5 57.8
Other accruals 9.5 (102.9) 73.4
Prepayments and other current assets (75.9) 36.7 (9.8)
Regulatory assets/liabilities (8.7) (26.2) (129.4)
Postretirement and postemployment benefits (64.3) (22.0) 84.7
Deferred charges and other noncurrent assets (20.8) (10.1) (4.1)
Other noncurrent liabilities and deferred credits 26.1 (6.7) (25.5)
Net Cash Flows from Operating Activities 1,781.5 1,935.1 1,409.4
Investing Activities      
Capital expenditures (2,614.0) (2,645.8) (2,203.1)
Proceeds from Insurance Settlement, Investing Activities 0.8 3.0 105.0
Cost of removal (166.8) (160.8) (151.7)
Purchases of available-for-sale securities (17.8) (42.8) (73.5)
Sales of available-for-sale securities 93.2 39.9 75.7
Milestone and final payments to renewable generation asset developer (482.0) (761.4) (323.9)
Advanced deposits for project costs (29.0) 0.0 0.0
Other investing activities 2.6 (3.7) 1.3
Net Cash Flows used for Investing Activities (3,213.0) (3,571.6) (2,570.2)
Financing Activities      
Proceeds from issuance of long-term debt 2,229.5 1,488.7 345.6
Repayments of long-term debt and finance lease obligations (25.6) (33.1) (60.3)
Repayment of short term credit agreements (1,650.0) 0.0 0.0
Issuance of short term credit agreements 0.0 650.0 1,000.0
Net change in commercial paper and other short-term borrowings (794.0) 636.4 202.2
Issuance of common stock, net of issuance costs 612.6 12.9 154.3
Redemption of preferred stock (486.1) (393.9) 0.0
Preferred stock redemption premium (14.0) (6.2) 0.0
Payment of obligation to renewable generation asset developer 0.0 (347.2) 0.0
Equity costs, premiums and other debt related costs (67.3) (30.2) (13.0)
Contributions from NIPSCO minority interest holders (99.5) (2,161.9) 0.0
Distributions to NIPSCO minority interest holders (50.3) 0.0 0.0
Distributions to tax equity partners (50.3) 0.0 0.0
Contributions from tax equity partners 0.0 240.9 21.2
Distributions to tax equity partners (16.1) (14.1) (6.0)
Dividends paid - common stock (481.0) (413.5) (381.5)
Dividends paid - preferred stock (8.2) (43.8) (55.1)
Contract liability payment 0.0 (66.6) (66.1)
Net Cash Flows (used for) from Financing Activities (651.0) 3,842.2 1,141.3
Change in cash, cash equivalents and restricted cash (2,082.5) 2,205.7 (19.5)
Cash, cash equivalents and restricted cash at beginning of period 2,281.1 75.4 94.9
Cash, Cash Equivalents and Restricted Cash at End of Period $ 198.6 $ 2,281.1 $ 75.4