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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities:      
Net income $ 276.0 $ 270.8 $ 251.2
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation, depletion and amortization 256.8 250.9 236.0
Deferred financing cost amortization 10.1 9.8 7.0
Stock compensation 7.0 8.6 9.7
Deferred income taxes 25.4 25.6 7.3
Employee benefit plans 11.5 5.5 9.6
Other adjustments, net 2.7 (4.7) 7.0
Change in certain operating assets and liabilities:      
Materials, supplies and fuel 51.4 (75.4) (35.7)
Accounts receivable and other current assets 204.5 (184.5) (43.2)
Accounts payable and other current liabilities (109.9) 89.4 10.6
Regulatory assets 236.8 203.9 (514.7)
Regulatory liabilities 0.0 0.0 (9.5)
Other operating activities, net (27.9) (15.1) 0.1
Net cash provided by (used in) operating activities 944.4 584.8 (64.6)
Investing activities:      
Property, plant and equipment additions (555.6) (604.4) (677.5)
Other investing activities 18.9 0.5 13.3
Net cash (used in) investing activities (536.7) (603.9) (664.2)
Financing activities:      
Dividends paid on common stock (168.1) (156.7) (145.0)
Common stock issued 118.3 90.1 119.0
Term Loan - borrowings 0.0 0.0 800.0
Term Loan - repayments 0.0 0.0 (800.0)
Net borrowings (payments) of Revolving Credit Facility and CP Program (535.6) 115.4 186.1
Long-term debt - issuance 800.0 0.0 600.0
Long-term debt - repayments (525.0) (8.4)
Distributions to non-controlling interests (18.3) (17.4) (15.7)
Other financing activities (13.0) 0.9 (4.1)
Net cash provided by (used in) financing activities (341.7) 32.3 731.9
Net change in cash, restricted cash and cash equivalents 66.0 13.2 3.1
Cash, restricted cash and cash equivalents beginning of year 27.0 13.8 10.7
Cash, restricted cash and cash equivalents end of year 93.0 27.0 13.8
Supplemental cash flow information:      
Interest (net of amounts capitalized) (157.3) (152.5) (142.7)
Income taxes (1.0) 0.8 1.5
Accrued property, plant and equipment purchases at December 31 52.4 59.3 68.8
Increase in capitalized assets associated with asset retirement obligations $ 3.8 $ 14.0 $ 2.1