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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:      
Net income $ 743.6 $ 765.0 $ 891.9
Adjustments to reconcile income to net cash from operating activities:      
Depreciation and amortization 1,076.5 929.4 896.4
Amortization of nuclear fuel 62.4 55.5 51.4
Amortization of deferred refueling outage 18.2 22.3 25.1
Amortization of corporate-owned life insurance 25.1 25.0 24.1
Non-cash compensation 17.7 18.8 15.6
Net deferred income taxes and credits (16.6) 7.3 102.2
Allowance for equity funds used during construction (10.8) (22.5) (29.4)
Payments for asset retirement obligations (21.8) (13.0) (22.6)
Equity in earnings of equity method investees, net of income taxes (7.4) (7.3) (8.2)
Income from corporate-owned life insurance (30.0) (5.6) (14.2)
Sibley Unit 3 impairment loss and other regulatory disallowances 0.0 34.9 0.0
Other 1.5 0.7 (13.8)
Changes in working capital items:      
Accounts receivable 54.5 (59.8) 69.9
Accounts receivable pledged as collateral 17.0 (40.0) 41.0
Fuel inventory and supplies (102.4) (105.6) (61.6)
Prepaid expenses and other current assets 136.6 (3.1) (299.8)
Accounts payable (47.2) 2.1 (55.1)
Accrued taxes (8.6) 32.2 41.4
Other current liabilities (43.8) 0.8 (19.4)
Changes in other assets 21.7 81.0 (251.5)
Changes in other liabilities 94.0 83.8 (31.7)
Cash Flows from Operating Activities 1,980.2 1,801.9 1,351.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:      
Additions to property, plant and equipment (2,334.0) (2,166.5) (1,972.5)
Acquisition of Persimmon Creek, net of cash acquired (217.9) 0.0 0.0
Purchase of securities - trusts (58.7) (50.5) (158.2)
Sale of securities - trusts 35.1 27.3 115.7
Investment in corporate-owned life insurance (16.0) (16.5) (14.2)
Proceeds from investment in corporate-owned life insurance 118.7 35.2 77.0
Other investing activities 1.1 18.8 38.4
Cash Flows used in Investing Activities (2,471.7) (2,152.2) (1,913.8)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:      
Short-term debt, net (381.9) 172.9 840.5
Proceeds from term loan facility 0.0 500.0 0.0
Repayment of term loan facility (500.0) 0.0 0.0
Collateralized short-term borrowings, net (17.0) 40.0 (41.0)
Issuance of common stock 0.0 0.0 112.5
Proceeds from long-term debt 2,444.8 567.7 497.3
Retirements of long-term debt (439.5) (410.9) (432.0)
Retirements of long-term debt of variable interest entities 0.0 0.0 (18.8)
Borrowings against cash surrender value of corporate-owned life insurance 53.2 53.5 54.4
Repayment of borrowings against cash surrender value of corporate-owned life insurance (89.8) (28.0) (62.3)
Cash dividends paid (569.6) (534.8) (497.9)
Other financing activities (6.2) (11.1) (9.3)
Cash Flows from Financing Activities 494.0 349.3 443.4
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 2.5 (1.0) (118.7)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:      
Beginning of period 25.2 26.2 144.9
End of period $ 27.7 $ 25.2 $ 26.2