Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

DISPOSITIONS (Details) - USD ($) $ in Millions	3 Months Ended
DISPOSITIONS (Details) - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016
Wisconsin \| WE
Dispositions
After-tax gain on sale	$ 6.5
Wisconsin \| WE \| Other operation and maintenance
Dispositions
Pre-tax gain on sale	10.9
Corporate and Other \| Wisvest
Dispositions
After-tax gain on sale	11.8
Corporate and Other \| Wisvest \| Other income, net
Dispositions
Pre-tax gain on sale	$ 19.6
Corporate and Other \| ITF
Dispositions
Pre-tax gain on sale		$ 0.0