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Schedule I - Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Future maturities of long-term debt outstanding |  |
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 | 14,655.7 | $ 13,472.4
WEC Energy Group |  |
Future maturities of long-term debt outstanding |  |
2023 | 700.0 |
2024 | 600.0 |
2025 | 620.0 |
2026 | 0.0 |
2027 | 900.0 |
Thereafter | 1,650.0 |
Total | 4,470.0 |
Long-term debt | 3,747.2 | $ 3,549.8
WEC Energy Group | WECC | Support agreement related to WECC debt |  |
Future maturities of long-term debt outstanding |  |
Long-term debt | $ 50.0 |

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