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ACQUISITIONS - BISHOP HILL III ACQUISITION - PURCHASE PRICE ALLOCATION (Details) - Bishop Hill III Wind Energy Center $ in Millions	1 Months Ended
	Aug. 31, 2018 USD ($)
Business Acquisition [Line Items]
Current assets	$ 1.4
Net property, plant, and equipment	189.0
Other long-term assets	4.5
Current liabilities	(1.6)
Long-term liabilities	(8.3)
Noncontrolling interest	(37.0)
Total purchase price	$ 148.0

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