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Long-Term Debt - Debt Maturing Within One Year (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Long-term debt maturing within one year |  |
2023 | $ 808.5 |
2024 | 1,239.6 |
2025 | 1,685.5 |
2026 | 126.8 |
2027 | 1,230.7 |
Thereafter | 10,468.7 |
Long-term Debt, Gross | 15,559.8 | $ 13,652.6
WEC Energy Group |  |
Long-term debt maturing within one year |  |
2023 | 700.0 |
2024 | 600.0 |
2025 | 620.0 |
2026 | 0.0 |
2027 | 900.0 |
Thereafter | $ 1,650.0 |
WEC 0.55% Senior Notes due September 15, 2023 | WEC Energy Group |  |
Long-term debt maturing within one year |  |
Interest rate | 0.55% |
Principal amount of unsecured debt | $ 700.0 |
WEPCo Environmental Trust Bonds 1.578%, due 2035 | WEPCo Environmental Trust Finance I, LLC |  |
Long-term debt maturing within one year |  |
Interest rate | 1.58% |
Principal amount of unsecured debt | $ 8.9 |
3.76% Bluewater Gas Storage senior notes | Bluewater Gas Storage |  |
Long-term debt maturing within one year |  |
Interest rate | 3.76% |
Principal amount of senior notes | $ 2.8 |
4.91% We Power subsidiaries notes - PWGS | We Power |  |
Long-term debt maturing within one year |  |
Interest rate | 4.91% |
Principal amount of secured debt | $ 7.6 |
5.209% We Power subsidiaries notes - ERGS | We Power |  |
Long-term debt maturing within one year |  |
Interest rate | 5.209% |
Principal amount of secured debt | $ 14.7 |
4.673% We Power subsidiaries notes - ERGS | We Power |  |
Long-term debt maturing within one year |  |
Interest rate | 4.673% |
Principal amount of secured debt | $ 11.1 |
6.00% We Power subsidiaries notes - PWGS | We Power |  |
Long-term debt maturing within one year |  |
Interest rate | 6.00% |
Principal amount of secured debt | $ 6.6 |
2.75% WECI Wind Holding I senior notes | WECI Wind Holding I |  |
Long-term debt maturing within one year |  |
Interest rate | 2.75% |
Principal amount of senior notes | $ 42.0 |
6.38% WECI Wind Holding II LLC Senior Notes Due 2031 | WECI Wind Holding II |  |
Long-term debt maturing within one year |  |
Interest rate | 6.38% |
Principal amount of senior notes | $ 14.8 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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