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Schedule I - Short-Term Notes Payable to Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Notes to parent company financial statements
Short-term notes payable to related parties	$ 406.0	$ 241.3
Integrys
Notes to parent company financial statements
Short-term notes payable to related parties	278.2	0.0
WECC
Notes to parent company financial statements
Short-term notes payable to related parties	110.2	109.3
WBS
Notes to parent company financial statements
Short-term notes payable to related parties	16.4	131.1
Wisvest
Notes to parent company financial statements
Short-term notes payable to related parties	0.9	0.9
Bluewater Gas Storage, LLC
Notes to parent company financial statements
Short-term notes payable to related parties	$ 0.3	$ 0.0

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The amount for notes payable (written promise to pay), due to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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