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ACQUISITIONS - UPSTREAM ACQUISITION (Details) - Upstream $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) MW
Business Acquisition [Line Items]
WEC's ownership interest in Upstream Wind Energy Center	80.00%
Capacity of Upstream Wind Energy Center | MW	202.5
Acquisition purchase price	$ 268.2
Cash and restricted cash acquired	$ 9.2
Number of years Upstream will receive fixed payment	10 years
Bonus depreciation percentage	100.00%

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Acquisition purchase price

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Bonus depreciation percentage

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Capacity of Upstream Wind Energy Center

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Cash and restricted cash acquired

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Number of years during which Upstream Wind Energy Center will receive a fixed payment in exchange for substantially all its energy output per energy swap agreement

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WEC's ownership interest in Upstream Wind Energy Center

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