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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Section S99
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Revolving credit facilities
Short-term credit capacity	$ 3,300.0
Available capacity under existing credit facility	727.7
Letter of credit
Revolving credit facilities
Letters of credit issued inside credit facilities	2.3
Commercial paper
Revolving credit facilities
Commercial paper outstanding	2,570.0	$ 2,017.2
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
Revolving credit facilities
Short-term credit capacity	$ 200.0