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Schedule I - Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities |  |  |
Net income attributed to common shareholders | $ 1,408.1 | $ 1,300.3 | $ 1,199.9
Reconciliation to cash provided by operating activities |  |  |
Equity income in subsidiaries, net of distributions | (74.3) | (25.1) | (29.1)
Deferred income taxes, net | 278.5 | 111.0 | 182.2
Loss on debt extinguishment | 0.0 | 36.3 | 38.4
Change in - |  |  |
Other current liabilities | 126.9 | (17.2) | (41.2)
Other, net | (169.5) | (92.5) | (29.3)
Net cash provided by operating activities | 2,060.7 | 2,032.7 | 2,196.0
Investing activities |  |  |
Capital contributions to subsidiaries | (45.5) | 0.0 | (21.2)
Other, net | 7.8 | 27.3 | (1.8)
Net cash used in investing activities | (2,642.4) | (2,311.8) | (2,806.8)
Financing activities |  |  |
Exercise of stock options | 33.6 | 15.7 | 43.8
Purchase of common stock | (69.2) | (33.1) | (99.2)
Dividends paid on common stock | (917.9) | (854.8) | (798.0)
Issuance of long-term debt | 1,999.3 | 2,383.8 | 2,373.6
Retirement of long-term debt | (92.1) | (1,260.4) | (1,767.0)
Issuance of short-term loan | 2.7 | 0.9 | 340.0
Repayment of short-term loan | 0.0 | (340.0) | 0.0
Change in commercial paper | (252.6) | 459.2 | 606.1
Payments for debt extinguishment and issuance costs | (15.6) | (67.2) | (55.8)
Other, net | (11.8) | (10.1) | (11.4)
Net cash used in financing activities | (676.4) | (294.0) | (601.1)
Net change in cash, cash equivalents, and restricted cash | 94.7 | 14.9 | (9.7)
Cash, cash equivalents, and restricted cash at beginning of year | 87.5 | 72.6 | 82.3
Cash, cash equivalents, and restricted cash at end of year | 182.2 | 87.5 | 72.6
WEC Energy Group |  |  |
Operating activities |  |  |
Net income attributed to common shareholders | 1,408.1 | 1,300.3 | 1,199.9
Reconciliation to cash provided by operating activities |  |  |
Equity income in subsidiaries, net of distributions | (437.4) | (571.3) | (385.7)
Deferred income taxes, net | 11.6 | (1.9) | 12.7
Loss on debt extinguishment | 0.0 | 23.1 | 38.4
Change in - |  |  |
Accounts receivable from related parties | (0.1) | 0.1 | 0.0
Prepaid income taxes | 21.1 | (2.1) | (7.9)
Accounts payable to related parties | (3.5) | (26.2) | 29.2
Accrued interest | 15.4 | 0.4 | (0.9)
Other current liabilities | (5.1) | 8.2 | (1.5)
Other, net | 5.8 | (2.5) | 9.6
Net cash provided by operating activities | 1,015.9 | 728.1 | 893.8
Investing activities |  |  |
Capital contributions to subsidiaries | (1,099.7) | (734.0) | (1,026.1)
Return of capital from subsidiaries | 372.9 | 196.1 | 602.8
Short-term notes receivable from related parties, net | (1.9) | 81.8 | (88.3)
Other, net | (2.0) | (1.1) | 3.7
Net cash used in investing activities | (730.7) | (457.2) | (507.9)
Financing activities |  |  |
Exercise of stock options | 33.6 | 15.7 | 43.8
Purchase of common stock | (69.2) | (33.1) | (99.2)
Dividends paid on common stock | (917.9) | (854.8) | (798.0)
Issuance of long-term debt | 900.0 | 1,100.0 | 1,650.0
Retirement of long-term debt | 0.0 | (300.0) | (1,430.0)
Issuance of short-term loan | 0.0 | 0.0 | 340.0
Repayment of short-term loan | 0.0 | (340.0) | 0.0
Change in commercial paper | (336.4) | 255.7 | 145.7
Short-term notes payable to related parties, net | 112.1 | (82.6) | (186.3)
Payments for debt extinguishment and issuance costs | (6.7) | (33.9) | (47.3)
Other, net | (1.2) | (1.4) | (1.1)
Net cash used in financing activities | 285.7 | 274.4 | 382.4
Net change in cash, cash equivalents, and restricted cash | (0.5) | (3.5) | 3.5
Cash, cash equivalents, and restricted cash at beginning of year | 0.5 | 4.0 | 0.5
Cash, cash equivalents, and restricted cash at end of year | $ 0.0 | $ 0.5 | $ 4.0

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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI https://asc.fasb.org/extlink&oid=126954810&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from short-term debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3098-108585 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other, maturing within one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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