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Summary of Significant Accounting Policies Nature of Operations (Details)	Dec. 31, 2018
Electric
Product Information
Number of customers	1,600,000
Natural gas
Product Information
Number of customers	2,900,000
ATC
Product Information
Equity method investment, ownership interest (as a percent)	60.00%
ATC HoldCo
Product Information
Equity method investment, ownership interest (as a percent)	75.00%
Bishop Hill III Wind Energy Center
Product Information
WEC's ownership interest in Bishop Hill III Wind Energy Center	90.00%
Coyote Ridge
Product Information
WEC's ownership interest in Coyote Ridge Wind, LLC	80.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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