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ACQUISITIONS - FORWARD ACQUISITION - PURCHASE PRICE ALLOCATION (Details) - Forward Wind Energy Center Acquisition - USD ($) $ in Millions | 1 Months Ended |
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Apr. 30, 2018 | Apr. 02, 2018
Business Acquisition [Line Items] |  |
Purchase price | $ 172.9 |
WPS |  |
Business Acquisition [Line Items] |  |
Current assets |  | $ 0.2
Net property, plant, and equipment |  | $ 76.9
Purchase price | $ 77.1 |

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