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PROPERTY, PLANT, AND EQUIPMENT (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 MW | Dec. 31, 2017 USD ($) | Mar. 31, 2018 USD ($)
Edgewater Unit 4 |  |  |
Property, plant, and equipment |  |  |
Plant to be retired, net |  |  | $ 12.7
Pleasant Prairie power plant |  |  |
Property, plant, and equipment |  |  |
Plant to be retired, net |  |  | 674.1
Presque Isle power plant |  |  |
Property, plant, and equipment |  |  |
Plant to be retired, net |  |  | 188.7
Pulliam power plant |  |  |
Property, plant, and equipment |  |  |
Plant to be retired, net |  |  | $ 43.6
UMERC |  |  |
Property, plant, and equipment |  |  |
Capacity of natural gas-fired generation facility (in megawatts) | MW | 180 |  |
Wisconsin |  |  |
Property, plant, and equipment |  |  |
Severance expense |  | $ 29.4 |

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