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ACQUISITIONS - BISHOP HILL III ACQUISITION (Details) - Bishop Hill III Wind Energy Center $ in Millions	1 Months Ended
	Aug. 31, 2018 USD ($) MW	Oct. 19, 2018
Business Acquisition [Line Items]
WEC's ownership interest in Bishop Hill III Wind Energy Center	80.00%
Capacity of Bishop Hill III Wind Energy Center | MW	132
Acquisition purchase price	$ 143.5
Restricted cash acquired	$ 4.5
Duration of offtake agreement for the sale of energy produced	22 years
Bonus depreciation percentage	100.00%
Measurement period to complete acquisition purchase price allocation	1 year
Subsequent event
Business Acquisition [Line Items]
Bonus depreciation percentage		100.00%
Additional Ownership Interest in Bishop Hill III Wind Energy Center		10.00%

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-Name Accounting Standards Codification
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Acquisition purchase price

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Additional Ownership Interest in Bishop Hill III Wind Energy Center

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Capacity of Bishop Hill III Wind Energy Center

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Duration of offtake agreement for the sale of energy produced

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WEC's ownership interest in Bishop Hill III Wind Energy Center

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