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Schedule I - Cash Dividends Received from Subsidiaries (Details) - WEC Energy Group - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Notes to parent company financial statements
Cash dividends received from subsidiaries	$ 548.6	$ 734.4	$ 538.8
WE
Notes to parent company financial statements
Cash dividends received from subsidiaries	240.0	455.0	240.0
We Power
Notes to parent company financial statements
Cash dividends received from subsidiaries	181.0	197.9	262.8
ATC Holding LLC
Notes to parent company financial statements
Cash dividends received from subsidiaries	82.6	6.5	6.0
WG
Notes to parent company financial statements
Cash dividends received from subsidiaries	$ 45.0	$ 75.0	$ 30.0

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- Definition

This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(b))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884

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