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LONG-TERM DEBT (Details) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2023	Mar. 31, 2023	Jan. 31, 2023
Integrys Holding | Integrys Holding Inc Junior Notes Due 2073
Debt Instrument [Line Items]
Interest rate on long-term debt		6.00%
Extinguishment of debt		$ 18.9
Unsecured debt		221.4
Early repayment of long-term debt		$ 18.6
WEC Energy Group | WEC 4.75% Senior Notes due January 9, 2026
Debt Instrument [Line Items]
Proceeds from issuance of debt			$ 650.0
Interest rate on long-term debt			4.75%
WEC Energy Group | WEC 4.75% Senior Notes due January 9, 2026 | Subsequent event
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 350.0
Interest rate on long-term debt	4.75%
WEC Energy Group | WEC 4.75% $450M Senior Notes due January 15, 2028
Debt Instrument [Line Items]
Proceeds from issuance of debt			$ 450.0
Interest rate on long-term debt			4.75%

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