Long-Term Debt - Maturities of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Long-term debt maturing within one year
2024	$ 1,264.2
2025	1,685.5
2026	1,726.8
2027	1,230.7
2028	2,307.2
Thereafter	8,509.9
Total	16,724.3	$ 15,559.8
WEC Energy Group
Long-term debt maturing within one year
2024	600.0
2025	620.0
2026	1,600.0
2027	900.0
2028	950.0
Thereafter	$ 1,150.0
WEC 0.80% $600M Senior Notes due March 2024 \| WEC Energy Group
Long-term debt maturing within one year
Interest rate	0.80%
Principal amount of unsecured debt	$ 600.0
2.38% WG Debentures due November 2024 \| WG
Long-term debt maturing within one year
Interest rate	2.38%
Principal amount of unsecured debt	$ 150.0
2.64% PGL Bonds due November 2024 \| PGL
Long-term debt maturing within one year
Interest rate	2.64%
Principal amount of secured debt	$ 75.0
2.05% WE Debentures due December 2024 \| WE
Long-term debt maturing within one year
Interest rate	2.05%
Principal amount of unsecured debt	$ 300.0
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	$ 9.0
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	$ 2.9
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	$ 8.0
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	$ 15.5
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	$ 11.7
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	$ 7.0
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	$ 61.3
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	$ 23.8

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.

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