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LONG-TERM DEBT (Details) - USD ($) $ in Millions			9 Months Ended
	Nov. 01, 2019	Oct. 24, 2019	Sep. 30, 2019
WEC Energy Group | WEC Senior Notes due 2022
Debt Instrument [Line Items]
Proceeds from Issuance of Debt			$ 350.0
Debt instrument stated interest rate percentage			3.10%
WPS | WPS Senior Notes due 2049
Debt Instrument [Line Items]
Proceeds from Issuance of Debt			$ 300.0
Debt instrument stated interest rate percentage			3.30%
UMERC | UMERC Senior Notes due 2029
Debt Instrument [Line Items]
Proceeds from Issuance of Debt			$ 160.0
Debt instrument stated interest rate percentage			3.26%
ATC Holding LLC | ATC Holding Senior Notes due 2029
Debt Instrument [Line Items]
Proceeds from Issuance of Debt			$ 235.0
Debt instrument stated interest rate percentage			3.75%
PGL | PGL Series GGG due 2029
Debt Instrument [Line Items]
Proceeds from Issuance of Debt			$ 275.0
Debt instrument stated interest rate percentage			2.96%
PGL | PGL Series UU due 2019
Debt Instrument [Line Items]
Repayments of Debt			$ 75.0
Debt instrument stated interest rate percentage			4.63%
Subsequent event | PGL | PGL Series HHH due 2024
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 75.0
Debt instrument stated interest rate percentage	2.64%
Subsequent event | PGL | PGL Series III due 2031
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 50.0
Debt instrument stated interest rate percentage	3.06%
Subsequent event | WG | WG Debentures due 2024
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 150.0
Debt instrument stated interest rate percentage		2.38%

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