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Schedule I - Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating activities |  |  |
Net income attributed to common shareholders | $ 1,331.7 | $ 1,408.1 | $ 1,300.3
Reconciliation to cash provided by operating activities |  |  |
Equity income in subsidiaries, net of distributions | (33.0) | (74.3) | (25.1)
Deferred income taxes, net | 229.9 | 278.5 | 111.0
Loss on debt extinguishment | 0.0 | 0.0 | 36.3
Change in - |  |  |
Other current assets | 18.9 | (27.7) | 17.6
Other current liabilities | 47.5 | 126.9 | (17.2)
Other, net | (156.5) | (169.5) | (92.5)
Net cash provided by operating activities | 3,018.4 | 2,060.7 | 2,032.7
Investing activities |  |  |
Capital contributions to subsidiaries | (63.7) | (45.5) | 0.0
Other, net | (12.6) | (11.4) | 27.3
Net cash used in investing activities | (3,558.2) | (2,642.4) | (2,311.8)
Financing activities |  |  |
Exercise of stock options | 6.3 | 33.6 | 15.7
Purchase of common stock | (16.6) | (69.2) | (33.1)
Dividends paid on common stock | (984.2) | (917.9) | (854.8)
Issuance of long-term debt | 2,170.0 | 1,999.3 | 2,383.8
Retirement of long-term debt | (1,005.4) | (92.1) | (1,260.4)
Repayment of short-term loan | (0.8) | 0.0 | (340.0)
Change in commercial paper | 373.7 | (252.6) | 459.2
Payments for debt extinguishment and issuance costs | (14.2) | (15.6) | (67.2)
Other, net | (6.0) | (9.1) | (9.2)
Net cash provided by financing activities | 522.8 | 676.4 | 294.0
Net change in cash, cash equivalents, and restricted cash | (17.0) | 94.7 | 14.9
Cash, cash equivalents, and restricted cash at beginning of year | 182.2 | 87.5 | 72.6
Cash, cash equivalents, and restricted cash at end of year | 165.2 | 182.2 | 87.5
WEC Energy Group |  |  |
Operating activities |  |  |
Net income attributed to common shareholders | 1,331.7 | 1,408.1 | 1,300.3
Reconciliation to cash provided by operating activities |  |  |
Equity income in subsidiaries, net of distributions | (566.8) | (437.4) | (571.3)
Deferred income taxes, net | (3.8) | 11.6 | (1.9)
Loss on debt extinguishment | 0.0 | 0.0 | 23.1
Change in - |  |  |
Accounts receivable from related parties | (2.0) | (0.1) | 0.1
Prepaid income taxes | 35.4 | 21.1 | (2.1)
Other current assets | (0.1) | 0.0 | 0.0
Accounts payable to related parties | 0.9 | (3.5) | (26.2)
Accrued interest | 42.1 | 15.4 | 0.4
Other current liabilities | (0.7) | (5.1) | 8.2
Other, net | 14.4 | 5.8 | (2.5)
Net cash provided by operating activities | 851.1 | 1,015.9 | 728.1
Investing activities |  |  |
Capital contributions to subsidiaries | (1,807.4) | (1,099.7) | (734.0)
Return of capital from subsidiaries | 175.2 | 372.9 | 196.1
Short-term notes receivable from related parties, net | 14.9 | (1.9) | 81.8
Other, net | 0.0 | (2.0) | (1.1)
Net cash used in investing activities | (1,617.3) | (730.7) | (457.2)
Financing activities |  |  |
Exercise of stock options | 6.3 | 33.6 | 15.7
Purchase of common stock | (16.6) | (69.2) | (33.1)
Dividends paid on common stock | (984.2) | (917.9) | (854.8)
Issuance of long-term debt | 2,050.0 | 900.0 | 1,100.0
Retirement of long-term debt | (700.0) | 0.0 | (300.0)
Repayment of short-term loan | 0.0 | 0.0 | (340.0)
Change in commercial paper | 297.3 | (336.4) | 255.7
Short-term notes payable to related parties, net | 127.1 | 112.1 | (82.6)
Payments for debt extinguishment and issuance costs | (13.3) | (6.7) | (33.9)
Other, net | (0.4) | (1.2) | (1.4)
Net cash provided by financing activities | 766.2 | (285.7) | (274.4)
Net change in cash, cash equivalents, and restricted cash | 0.0 | (0.5) | (3.5)
Cash, cash equivalents, and restricted cash at beginning of year | 0.0 | 0.5 | 4.0
Cash, cash equivalents, and restricted cash at end of year | $ 0.0 | $ 0.0 | $ 0.5

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