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PROPERTY, PLANT, AND EQUIPMENT (Details) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2017 MW | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Net book value of property, plant, and equipment |  | $ 20,882.9 | $ 19,915.5
UMERC | Subsequent event |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capacity of natural gas-fired generation facility (in megawatts) | MW | 180 |  |
WE | Presque Isle Power Plant |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net book value of property, plant, and equipment |  | 203.0 |
WPS | Edgewater Unit 4 | Plant to be retired |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net book value of property, plant, and equipment |  | $ 13.3 |

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