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LONG-TERM DEBT (Details) - USD ($) $ in Millions	Oct. 09, 2020	Sep. 17, 2020	Aug. 01, 2020	May 15, 2020	Apr. 29, 2020
WEC Energy Group | WEC Senior Notes 2.45% due June 15, 2020
Debt Instrument [Line Items]
Early repayment of senior notes				$ 400.0
Debt instrument stated interest rate percentage				2.45%
WEC Energy Group | WEC Senior Notes .55% due September 15, 2023
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 700.0
Debt instrument stated interest rate percentage		0.55%
PGL | PGL Series WW Bonds (secured) 1.875% due 2033
Debt Instrument [Line Items]
Repayments of secured debt			$ 50.0
Debt instrument stated interest rate percentage			1.875%
MERC | MERC Senior Notes 2.69% due May 1, 2025
Debt Instrument [Line Items]
Proceeds from issuance of debt					$ 50.0
Debt instrument stated interest rate percentage					2.69%
MGU | MGU Senior Notes 2.69% due May 1, 2025
Debt Instrument [Line Items]
Proceeds from issuance of debt					$ 60.0
Debt instrument stated interest rate percentage					2.69%
Subsequent event
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 27.9
Subsequent event | WEC Energy Group | WEC Senior Notes 1.375% due October 15, 2027
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 500.0
Debt instrument stated interest rate percentage	1.375%
Subsequent event | WEC Energy Group | WEC Senior Notes 1.800% due October 15, 2030
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 450.0
Debt instrument stated interest rate percentage	1.80%
Subsequent event | WEC Energy Group | WEC Senior Notes 3.375% due June 15, 2021
Debt Instrument [Line Items]
Early repayment of senior notes	$ 600.0
Debt instrument stated interest rate percentage	3.375%
Subsequent event | WEC Energy Group | WEC Senior Notes 3.10% due March 8, 2022
Debt Instrument [Line Items]
Early repayment of senior notes	$ 350.0
Debt instrument stated interest rate percentage	3.10%

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