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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Activities      
Net Income $ 121.7 $ 178.9 $ 131.3
Adjustments to Reconcile Net Income to Cash provided by Operating Activities:      
AFUDC – Equity (5.0) (3.6) (2.7)
Income from Equity Investments – Net of Dividends (1.8) 1.0 2.4
(Gain) / Loss on Investments and Property, Plant and Equipment 0.0 0.0 1.2
Depreciation Expense 271.3 251.7 242.0
Amortization of PSAs (5.0) (5.2) (7.6)
Amortization of Other Intangible Assets and Other Assets 6.9 7.1 8.3
Deferred Income Tax Expense (Benefit) (15.8) 17.6 (38.5)
Share-Based and ESOP Compensation Expense 6.6 7.3 4.9
Defined Benefit Pension and Other Postretirement Plan Expense (Benefit) (13.8) (6.1) (3.0)
Bad Debt Expense 1.4 1.3 1.9
Fuel Adjustment Clause 0.6 44.0 15.1
Provision (Payments) for Interim Rate Refund 23.0 (18.4) 18.4
Changes in Operating Assets and Liabilities      
Accounts Receivable (13.1) 1.8 (14.0)
Inventories 7.5 277.1 (256.1)
Prepayments and Other (10.5) (7.9) (21.5)
Accounts Payable (2.7) (4.0) (1.3)
Other Current Liabilities 0.9 (157.6) 116.2
Renewable Tax Credit Sales 61.1 0.0 0.0
Cash Contributions to Defined Benefit Pension Plans (25.0) (17.3) 0.0
Changes in Regulatory and Other Non-Current Assets 42.2 15.6 24.1
Changes in Regulatory and Other Non-Current Liabilities 6.6 2.0 0.2
Cash provided by Operating Activities 457.1 585.3 221.3
Investing Activities      
Proceeds from Sale of Available-for-sale Securities 2.0 1.0 2.2
Payments for Purchase of Available-for-sale Securities (2.4) (1.2) (2.4)
Acquisitions of Subsidiaries – Net of Cash and Restricted Cash Acquired 0.0 0.0 (155.0)
Payments for Equity Investments (5.8) (8.2) (5.9)
Additions to Property, Plant and Equipment (354.9) (271.2) (220.5)
Other Investing Activities 20.4 (4.0) (2.4)
Cash used in Investing Activities (340.7) (283.6) (384.0)
Financing Activities      
Proceeds from Issuance of Common Stock 12.9 14.9 248.0
Equity Issuance Costs 0.0 0.0 (8.1)
Proceeds from Issuance of Short-Term and Long-Term Debt 658.0 437.0 785.4
Repayments of Short-Term and Long-Term Debt (649.4) (566.7) (877.0)
Proceeds from Non-Controlling Interest in Subsidiaries – Net of Issuance Costs 4.1 17.8 155.7
Distributions to Non-Controlling Interest (1.5) (8.5) (1.7)
Dividends on Common Stock (162.8) (155.5) (145.9)
Other Financing Activities (1.9) (1.5) (1.2)
Cash provided (used in) by Financing Activities (140.6) (262.5) 155.2
Change in Cash, Cash Equivalents and Restricted Cash (24.2) 39.2 (7.5)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 79.4 40.2 47.7
Cash, Cash Equivalents and Restricted Cash at End of Period $ 55.2 $ 79.4 $ 40.2