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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities:    
Net income $ 131.6 $ 117.4
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 65.9 61.6
Deferred financing cost amortization 2.7 2.4
Stock compensation 2.4 1.8
Deferred income taxes 16.7 14.9
Employee benefit plans 3.0 3.0
Other adjustments, net (0.3) (2.9)
Change in certain operating assets and liabilities:    
Materials, supplies and fuel 30.4 76.1
Accounts receivable and other current assets (11.3) 28.7
Accounts payable and other current liabilities (59.6) (127.2)
Regulatory assets 54.8 154.7
Other operating activities, net (2.9) (1.8)
Net cash provided by operating activities 233.4 328.7
Investing activities:    
Property, plant and equipment additions (176.2) (119.1)
Other investing activities (0.7) 17.6
Net cash (used in) investing activities (176.9) (101.5)
Financing activities:    
Dividends paid on common stock (44.4) (41.4)
Common stock issued 31.2 27.4
Net borrowings (payments) of Revolving Credit Facility and CP Program 0.0 (535.6)
Long-term debt - issuance 0.0 350.0
Distributions to non-controlling interests (5.6) (4.5)
Other financing activities (1.0) (5.0)
Net cash (used in) financing activities (19.8) (209.1)
Net change in cash, restricted cash and cash equivalents 36.7 18.1
Cash, restricted cash and cash equivalents beginning of period 93.0 27.0
Cash, restricted cash and cash equivalents end of period 129.7 45.1
Supplemental cash flow information:    
Interest (net of amounts capitalized) (33.6) (27.6)
Accrued property, plant and equipment purchases at March 31, $ 37.7 $ 42.1