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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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Revolving credit facilities
Short-term credit capacity		$ 3,100.0
Available capacity under existing credit facility		1,552.4
Letter of credit
Revolving credit facilities
Letters of credit issued inside credit facilities		2.3
Commercial paper
Revolving credit facilities
Commercial paper outstanding		1,545.3	$ 1,643.5
WE \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity		500.0
WPS \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity		400.0
WG \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity		350.0
PGL \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity		350.0
WEC Energy Group \| Credit facility maturing September 2026
Revolving credit facilities
Short-term credit capacity		$ 1,500.0
WEC Energy Group \| Credit facility maturing October 2024 \| Subsequent event
Revolving credit facilities
Short-term credit capacity increase	$ 200.0