LONG-TERM DEBT (Details) - WEC Energy Group - USD ($) $ in Millions		1 Months Ended
	Feb. 07, 2024	Mar. 31, 2024
Floating Rate WEC Energy Group Junior Notes Due 2067
Debt Instrument [Line Items]
Extinguishment of debt	$ 122.1
Unsecured debt	500.0
Repayment of long-term debt	115.2
Gain on early extinguishment of debt	$ 6.9
WEC 0.80% Senior Notes $600M due March 15, 2024
Debt Instrument [Line Items]
Repayment of long-term debt		$ 600.0
Interest rate on long-term debt		0.80%