Short-Term Debt and Lines of Credit - Outstanding Amounts (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
WE
Short-term Debt [Line Items]
Maximum debt to capitalization ratio	65.00%
WPS
Short-term Debt [Line Items]
Maximum debt to capitalization ratio	65.00%
WG
Short-term Debt [Line Items]
Maximum debt to capitalization ratio	65.00%
PGL
Short-term Debt [Line Items]
Maximum debt to capitalization ratio	65.00%
WEC Energy Group
Short-term Debt [Line Items]
Commercial paper outstanding	$ 382.7	$ 697.0
Maximum debt to capitalization ratio	70.00%
Commercial paper
Short-term Debt [Line Items]
Commercial paper outstanding	$ 1,114.4	$ 2,017.2
Average interest rate on amount outstanding	4.63%	5.49%
Average amount outstanding during the year	$ 1,313.4
Weighted- average interest rate during the year	5.38%
Operating expense loans
Short-term Debt [Line Items]
Operating expense loan outstanding	$ 2.2	$ 3.7

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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