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Acquisitions - Bishop Hill III (Details) - Bishop Hill III Wind Energy Center $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2018 USD ($) MW	Dec. 31, 2018 USD ($)
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	$ 144.7	$ 18.2
Additional Ownership Interest in Bishop Hill III Wind Energy Center		10.00%
Duration of offtake agreement for the sale of energy produced	22 years
Bonus depreciation percentage		100.00%
Current assets		$ 1.4
Net property, plant, and equipment		190.2
Other long-term assets	$ 4.5	4.5
Current liabilities		(1.6)
Long-term liabilities		(8.3)
Noncontrolling interest		(18.8)
Total purchase price		$ 167.4

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