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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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The capacity (in megawatts) of a natural gas-fired generation facility.

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