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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities:    
Net income $ 191.1 $ 182.6
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 210.5 201.8
Deferred financing cost amortization 7.2 8.2
Stock compensation 8.0 8.2
Deferred income taxes 40.6 39.6
Employee benefit plans 8.9 8.9
Other adjustments, net 2.8 (1.8)
Changes in certain operating assets and liabilities:    
Materials, supplies and fuel (19.0) 10.9
Accounts receivable and other current assets 90.8 123.9
Accounts payable and other current liabilities (70.4) (61.8)
Regulatory assets 47.1 61.6
Other operating activities, net (12.3) (16.0)
Net cash provided by operating activities 505.3 566.1
Investing activities:    
Property, plant and equipment additions (550.2) (530.5)
Other investing activities (6.2) (1.5)
Net cash (used in) investing activities (556.4) (532.0)
Financing activities:    
Dividends paid on common stock (146.8) (135.8)
Common stock issued 219.2 181.6
Net borrowings (payments) of Revolving Credit Facility and CP Program (7.8) 17.5
Long-term debt - issuance 0.0 450.0
Long-term debt - repayments 0.0 (600.0)
Distributions to non-controlling interests (5.2) (12.5)
Other financing activities (2.6) (8.3)
Net cash provided by (used in) financing activities 56.8 (107.5)
Net change in cash, restricted cash and cash equivalents 5.7 (73.4)
Cash, restricted cash and cash equivalents beginning of period 23.4 93.0
Cash, restricted cash and cash equivalents end of period 29.1 19.6
Supplemental cash flow information:    
Interest (net of amounts capitalized) (145.4) (122.5)
Income taxes, net of transferred tax credits (Note 11) 12.9 14.6
Accrued property, plant, and equipment purchases at September 30, $ 121.7 $ 64.0