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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities:    
Net income $ 182.6 $ 192.7
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 201.8 191.2
Deferred financing cost amortization 8.2 6.9
Stock compensation 8.2 4.6
Deferred income taxes 39.6 16.1
Employee benefit plans 8.9 7.9
Other adjustments, net (1.8) (6.1)
Change in certain operating assets and liabilities:    
Materials, supplies and fuel 10.9 43.5
Accounts receivable and other current assets 123.9 302.8
Accounts payable and other current liabilities (61.8) (186.5)
Regulatory assets 61.6 199.1
Other operating activities, net (16.0) (16.2)
Net cash provided by operating activities 566.1 756.0
Investing activities:    
Property, plant and equipment additions (530.5) (421.8)
Other investing activities (1.5) 18.0
Net cash (used in) investing activities (532.0) (403.8)
Financing activities:    
Dividends paid on common stock (135.8) (125.4)
Common stock issued 181.6 107.4
Net borrowings (payments) of Revolving Credit Facility and CP Program 17.5 (535.6)
Long-term debt - issuance 450.0 800.0
Long-term debt - repayments (600.0) 0.0
Distributions to non-controlling interests (12.5) (12.9)
Other financing activities (8.3) (12.2)
Net cash provided by (used in) financing activities (107.5) 221.3
Net change in cash, restricted cash and cash equivalents (73.4) 573.5
Cash, restricted cash and cash equivalents beginning of period 93.0 27.0
Cash, restricted cash and cash equivalents end of period 19.6 600.5
Supplemental cash flow information:    
Interest (net of amounts capitalized) (122.5) (108.8)
Income taxes, net of transferred tax credits (Note 11) 14.6 0.1
Accrued property, plant and equipment purchases at September 30, $ 64.0 $ 53.0