Regulatory Environment - WI 2025 and 2026 Rates (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions	Dec. 19, 2024 USD ($)
WE | 2025 Rates | Electric
Public Utilities, General Disclosures
Approved rate increase	$ 144.0
Approved rate increase (as a percent)	4.20%
WE | 2025 Rates | Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 41.3
Approved rate increase (as a percent)	7.10%
WE | 2025 Rates | Steam
Public Utilities, General Disclosures
Approved rate increase	$ 1.5
Approved rate increase (as a percent)	5.00%
WE | 2026 Rates | Electric
Public Utilities, General Disclosures
Approved rate increase	$ 169.5
Approved rate increase (as a percent)	4.50%
WE | 2026 Rates | Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 29.8
Approved rate increase (as a percent)	4.50%
WE | 2025 and 2026 Rates
Public Utilities, General Disclosures
Approved return on equity (as a percent)	9.80%
Approved common equity component average (as a percent)	53.00%
Percentage of first 15 basis points of additional earnings retained by the utility	100.00%
Return on equity in excess of authorized amount (as a percent)	0.15%
Percentage of additional earnings between 15 and 40 basis points refunded to customers	50.00%
Return on equity in excess of first 15 basis points above authorized amount (as a percent)	0.25%
Percentage of earnings in excess of 40 basis points refunded to customers	100.00%
WPS | 2025 Rates | Electric
Public Utilities, General Disclosures
Approved rate increase	$ 55.1
Approved rate increase (as a percent)	4.50%
WPS | 2025 Rates | Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 14.9
Approved rate increase (as a percent)	3.80%
WPS | 2026 Rates | Electric
Public Utilities, General Disclosures
Approved rate increase	$ 30.0
Approved rate increase (as a percent)	2.30%
WPS | 2026 Rates | Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 13.5
Approved rate increase (as a percent)	3.10%
WPS | 2025 and 2026 Rates
Public Utilities, General Disclosures
Approved return on equity (as a percent)	9.80%
Approved common equity component average (as a percent)	53.00%
Percentage of first 15 basis points of additional earnings retained by the utility	100.00%
Return on equity in excess of authorized amount (as a percent)	0.15%
Return on equity in excess of first 15 basis points above authorized amount (as a percent)	0.60%
Percentage of additional earnings between 15 and 75 basis points refunded to customers	50.00%
Percentage of earnings in excess of 75 basis points refunded to customers	100.00%
WG | 2025 Rates | Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 34.5
Approved rate increase (as a percent)	4.20%
WG | 2026 Rates | Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 23.5
Approved rate increase (as a percent)	2.60%
WG | 2025 and 2026 Rates
Public Utilities, General Disclosures
Approved return on equity (as a percent)	9.80%
Approved common equity component average (as a percent)	53.00%
Percentage of first 15 basis points of additional earnings retained by the utility	100.00%
Return on equity in excess of authorized amount (as a percent)	0.15%
Return on equity in excess of first 15 basis points above authorized amount (as a percent)	0.60%
Percentage of additional earnings between 15 and 75 basis points refunded to customers	50.00%
Percentage of earnings in excess of 75 basis points refunded to customers	100.00%