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Acquisitions - Coyote Ridge (Details) - Coyote Ridge
$ in Millions
1 Months Ended
Dec. 31, 2018
USD ($)
MW
Business Acquisition [Line Items]  
Net property, plant, and equipment $ 66.4
WEC's ownership interest in Coyote Ridge Wind, LLC 80.00%
Capacity of Coyote Ridge | MW 97.5
Acquisition purchase price $ 61.4
Duration of offtake agreement for the sale of energy produced 12 years
Bonus depreciation percentage 100.00%
Percent of tax benefits entitled to 99.00%
Noncontrolling interest $ (5.0)
Total purchase price $ 61.4