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Schedule I - Short-Term Notes Receivable from Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Notes to parent company financial statements
Short-term notes receivable from related parties	$ 64.1	$ 76.4
UMERC
Notes to parent company financial statements
Short-term notes receivable from related parties	38.1	0.0
Wispark
Notes to parent company financial statements
Short-term notes receivable from related parties	26.0	15.9
Integrys
Notes to parent company financial statements
Short-term notes receivable from related parties	0.0	42.0
Bostco
Notes to parent company financial statements
Short-term notes receivable from related parties	$ 0.0	$ 18.5

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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