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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Revolving credit facilities
Short-term credit capacity	$ 3,900.0
Available capacity under existing credit facility	2,641.6
Letter of credit
Revolving credit facilities
Letters of credit issued inside credit facilities	2.3
Commercial paper
Revolving credit facilities
Commercial paper outstanding	1,256.1	$ 1,114.4
WE | Credit facility maturing August 2030
Revolving credit facilities
Short-term credit capacity	800.0
PGL | Credit facility maturing August 2030
Revolving credit facilities
Short-term credit capacity	600.0
WPS | Credit facility maturing August 2030
Revolving credit facilities
Short-term credit capacity	450.0
WG | Credit facility maturing August 2030
Revolving credit facilities
Short-term credit capacity	350.0
WEC Energy Group | Credit facility maturing August 2030
Revolving credit facilities
Short-term credit capacity	1,700.0
WEC Energy Group | Credit facility maturing October 2025
Revolving credit facilities
Short-term credit capacity	$ 200.0

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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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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