| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: | | | | | | |
| Net income | 891.9 | 630.0 | 685.6 | 546.0 | 336.5 | 361.2 |
| Adjustments to reconcile income to net cash from operating activities: | | | | | | |
| Depreciation and amortization | 896.4 | 880.1 | 861.7 | 618.8 | 371.7 | 338.5 |
| Amortization of nuclear fuel | 51.4 | 58.3 | 51.4 | 43.6 | 32.2 | 26.7 |
| Amortization of deferred refueling outage | 25.1 | 25.4 | 25.5 | 21.2 | 16.1 | 18.4 |
| Amortization of corporate-owned life insurance | 24.1 | 20.1 | 19.8 | 22.6 | 20.6 | 18.0 |
| Non-cash compensation | 15.6 | 16.0 | 16.3 | 29.9 | 8.8 | 9.3 |
| Net deferred income taxes and credits | 102.2 | 126.9 | 121.5 | 124.2 | 149.6 | 185.2 |
| Allowance for equity funds used during construction | -29.4 | -17.2 | -2.2 | -3.1 | -2.0 | -11.6 |
| Payments for asset retirement obligations | -22.6 | -18.4 | -17.8 | -22.4 | -16.0 | -5.4 |
| Equity in earnings of equity method investees, net of income taxes | -8.2 | -8.3 | -9.8 | -5.4 | -6.7 | -6.5 |
| Income from corporate-owned life insurance | -14.2 | -8.2 | -29.6 | -2.3 | -2.8 | |
| Other | -13.8 | 0.8 | -3.2 | -5.2 | -8.7 | -22.0 |
| Changes in working capital items: | | | | | | |
| Accounts receivable | 69.9 | -4.9 | -23.1 | 265.1 | -2.1 | -30.3 |
| Accounts receivable pledged as collateral | 41.0 | -21.0 | 26.0 | -185.0 | | |
| Fuel inventory and supplies | -61.6 | -22.3 | 29.9 | 54.7 | 7.2 | 1.8 |
| Prepaid expenses and other current assets | -299.8 | 16.9 | 43.4 | -128.1 | 55.8 | -18.3 |
| Accounts payable | -55.1 | 134.3 | 16.9 | 56.7 | 10.0 | -8.1 |
| Accrued taxes | 41.4 | 6.7 | -8.2 | -76.4 | 9.2 | -5.9 |
| Other current liabilities | -19.4 | -98.9 | -59.4 | 92.0 | -118.0 | -86.4 |
| Changes in other assets | -251.5 | 119.5 | 79.8 | 66.8 | 32.0 | 21.4 |
| Changes in other liabilities | -31.7 | -82.0 | -75.5 | -15.9 | 19.3 | 23.3 |
| Cash Flows from Operating Activities | 1,351.7 | 1,753.8 | 1,749.0 | 1,497.8 | 912.7 | 803.8 |
| |
| CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: | | | | | | |
| Additions to property, plant and equipment | -1,972.5 | -1,560.3 | -1,210.1 | -1,069.7 | -764.6 | -1,087.0 |
| Purchase of securities - trusts | -158.2 | -65.6 | -55.8 | -117.5 | -41.0 | -46.6 |
| Sale of securities - trusts | 115.7 | 56.5 | 47.3 | 117.7 | 41.2 | 47.0 |
| Investment in corporate-owned life insurance | -14.2 | -19.1 | -18.3 | -17.1 | -17.0 | -18.1 |
| Proceeds from investment in corporate-owned life insurance | 77.0 | 65.9 | 161.7 | 6.8 | | |
| Other investing activities | 38.4 | -11.1 | -5.1 | -17.6 | -3.6 | -4.1 |
| Cash Flows used in Investing Activities | -1,913.8 | -1,533.7 | -1,080.3 | 197.4 | -780.8 | -994.1 |
| |
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | | | | | | |
| Short-term debt, net | 840.5 | -246.9 | -176.7 | -104.0 | -91.3 | 116.2 |
| Proceeds from term loan facility | 497.3 | 888.8 | 3,372.7 | 290.9 | | |
| Repayment of term loan facility | | | | | | |
| Collateralized short-term borrowings, net | -41.0 | 21.0 | -26.0 | 185.0 | | |
| Issuance of common stock | 112.5 | | | | | |
| Proceeds from long-term debt | 497.3 | 888.8 | 2,372.7 | 290.9 | 296.2 | 396.3 |
| Retirements of long-term debt | -432.0 | -251.1 | -701.1 | -395.8 | -125.0 | -50.0 |
| Retirements of long-term debt of variable interest entities | -18.8 | -32.3 | -30.3 | -28.5 | -26.8 | |
| Borrowings against cash surrender value of corporate-owned life insurance | 54.4 | 55.5 | 59.4 | 56.5 | 55.1 | 57.8 |
| Repayment of borrowings against cash surrender value of corporate-owned life insurance | -62.3 | -54.8 | -127.5 | -3.9 | -1.0 | -89.3 |
| Cash dividends paid | -497.9 | -465.0 | -462.5 | -475.0 | -223.1 | -204.3 |
| Distributions to shareholders of noncontrolling interests | | | | | | |
| Other financing activities | -9.3 | -13.6 | -6.7 | -21.3 | -9.9 | -8.1 |
| Cash Flows from Financing Activities | 443.4 | -98.4 | -805.8 | -1,538.4 | -131.6 | 190.2 |
| NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | -118.7 | 121.7 | -137.1 | 156.8 | 0.3 | -0.1 |
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| CASH, CASH EQUIVALENTS AND RESTRICTED CASH: | | | | | | |