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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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