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PROPERTY, PLANT, AND EQUIPMENT (Details) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2017 MW | Jun. 30, 2018 USD ($)
Edgewater Unit 4 |  |
Property, plant, and equipment |  |
Plant to be retired, at carrying value |  | $ 12.3
Plant to be retired, net |  | 14.2
Cost of removal reserve |  | 1.9
Pleasant Prairie power plant |  |
Property, plant, and equipment |  |
Plant to be retired, at carrying value |  | 667.7
Plant to be retired, net |  | 774.2
Cost of removal reserve |  | 106.5
Presque Isle power plant |  |
Property, plant, and equipment |  |
Plant to be retired, at carrying value |  | 189.7
Plant to be retired, net |  | 199.8
Cost of removal reserve |  | 10.1
Pulliam power plant |  |
Property, plant, and equipment |  |
Plant to be retired, at carrying value |  | 42.3
Plant to be retired, net |  | 62.1
Cost of removal reserve |  | 19.8
UMERC |  |
Property, plant, and equipment |  |
Capacity of natural gas-fired generation facility (in megawatts) | MW | 180 |
Wisconsin |  |
Changes to severance liability |  |
Severance liability, balance at beginning of period |  | 29.4
Severance payments |  | (8.7)
Other |  | (3.0)
Severance liability, balance at end of period |  | $ 17.7

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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