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LONG-TERM DEBT (Details) - USD ($) $ in Millions		1 Months Ended
	Aug. 15, 2023	Sep. 30, 2023	Aug. 31, 2023	Apr. 30, 2023	Mar. 31, 2023	Jan. 31, 2023	Jul. 01, 2023
Integrys Holding | Integrys Holding Inc Junior Notes Due 2073
Debt Instrument [Line Items]
Unsecured debt					$ 221.4
Interest rate on long-term debt			6.00%		6.00%
Extinguishment of debt			$ 202.5		$ 18.9
Early repayment of long-term debt					$ 18.6
WEC Energy Group | Floating Rate WEC Energy Group Junior Notes Due 2067
Debt Instrument [Line Items]
Unsecured debt	$ 500.0						$ 500.0
Credit spread adjustment	0.26161%
WEC Energy Group | WEC 4.75% Senior Notes due January 9, 2026
Debt Instrument [Line Items]
Proceeds from issuance of debt				$ 350.0		$ 650.0
Interest rate on long-term debt				4.75%		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%
WEC Energy Group | WEC 5.60% Senior Notes due September 12, 2026
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 600.0
Interest rate on long-term debt		5.60%
WEC Energy Group | WEC 0.55% Senior Notes due September 15, 2023
Debt Instrument [Line Items]
Interest rate on long-term debt		0.55%
Early repayment of long-term debt		$ 700.0

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