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Schedule I - Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities |  |  |
Net income attributed to common shareholders | $ 1,527.2 | $ 1,331.7 | $ 1,408.1
Reconciliation to cash provided by operating activities |  |  |
Equity income in subsidiaries, net of distributions | (57.4) | (33.0) | (74.3)
Deferred income taxes, net | 538.7 | 229.9 | 278.5
Gain on debt extinguishments | (23.1) | (0.5) | 0.0
Change in - |  |  |
Other current assets | (75.4) | 36.3 | 32.3
Other current liabilities | 11.6 | 47.5 | 126.9
Other, net | (34.8) | (156.5) | (169.5)
Net cash provided by operating activities | 3,211.8 | 3,018.4 | 2,060.7
Investing activities |  |  |
Capital contributions to subsidiaries | (45.5) | (63.7) | (45.5)
Other, net | 10.1 | (21.9) | (10.6)
Net cash used in investing activities | (3,802.5) | (3,558.2) | (2,642.4)
Financing activities |  |  |
Exercise of stock options | 23.7 | 6.3 | 33.6
Issuance of common stock, net | 163.4 | 0.0 | 0.0
Purchase of common stock | (3.2) | (16.6) | (69.2)
Dividends paid on common stock | (1,056.2) | (984.2) | (917.9)
Issuance of long-term debt | 4,460.9 | 2,170.0 | 1,999.3
Retirement of long-term debt | (2,138.0) | (1,005.4) | (92.1)
Change in commercial paper | (902.8) | 373.7 | (252.6)
Payments for debt extinguishment and issuance costs | (45.9) | (14.2) | (15.6)
Other, net | (6.1) | (6.8) | (9.1)
Net cash provided by financing activities | 467.7 | 522.8 | 676.4
Net change in cash, cash equivalents, and restricted cash | (123.0) | (17.0) | 94.7
Cash, cash equivalents, and restricted cash at beginning of year | 165.2 | 182.2 | 87.5
Cash, cash equivalents, and restricted cash at end of year | 42.2 | 165.2 | 182.2
WEC Energy Group |  |  |
Operating activities |  |  |
Net income attributed to common shareholders | 1,527.2 | 1,331.7 | 1,408.1
Reconciliation to cash provided by operating activities |  |  |
Equity income in subsidiaries, net of distributions | (931.8) | (566.8) | (437.4)
Deferred income taxes, net | (2.1) | (3.8) | 11.6
Gain on debt extinguishments | (23.1) | 0.0 | 0.0
Change in - |  |  |
Accounts receivable from related parties | 0.0 | (2.0) | (0.1)
Prepaid income taxes | (16.3) | 35.4 | 21.1
Other current assets | 0.2 | (0.1) | 0.0
Accounts payable to related parties | 0.2 | 0.9 | (3.5)
Accrued interest | (3.6) | 42.1 | 15.4
Other current liabilities | (0.6) | (0.7) | (5.1)
Other, net | 15.5 | 14.4 | 5.8
Net cash provided by operating activities | 565.6 | 851.1 | 1,015.9
Investing activities |  |  |
Capital contributions to subsidiaries | (1,273.9) | (1,807.4) | (1,099.7)
Return of capital from subsidiaries | 846.6 | 175.2 | 372.9
Short-term notes receivable from related parties, net | (47.2) | 14.9 | (1.9)
Other, net | 0.0 | 0.0 | (2.0)
Net cash used in investing activities | (474.5) | (1,617.3) | (730.7)
Financing activities |  |  |
Exercise of stock options | 23.7 | 6.3 | 33.6
Issuance of common stock, net | 163.4 | 0.0 | 0.0
Purchase of common stock | (3.2) | (16.6) | (69.2)
Dividends paid on common stock | (1,056.2) | (984.2) | (917.9)
Issuance of long-term debt | 2,475.0 | 2,050.0 | 900.0
Retirement of long-term debt | (1,473.7) | (700.0) | 0.0
Change in commercial paper | (314.3) | 297.3 | (336.4)
Short-term notes payable to related parties, net | 121.3 | 127.1 | 112.1
Payments for debt extinguishment and issuance costs | (27.0) | (13.3) | (6.7)
Other, net | (0.1) | (0.4) | (1.2)
Net cash provided by financing activities | (91.1) | 766.2 | (285.7)
Net change in cash, cash equivalents, and restricted cash | 0.0 | 0.0 | (0.5)
Cash, cash equivalents, and restricted cash at beginning of year | 0.0 | 0.0 | 0.5
Cash, cash equivalents, and restricted cash at end of year | $ 0.0 | $ 0.0 | $ 0.0

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 9 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-9 + Details
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