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Schedule I - Short-Term Notes Payable to Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Notes to parent company financial statements |  |
Short-term notes payable to related parties | $ 398.9 | $ 406.0
Integrys |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | 139.5 | 278.2
WBS |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | 123.5 | 16.4
WECC |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | 110.3 | 110.2
Bluewater Gas Storage, LLC |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | 25.6 | 0.3
Wisvest |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | $ 0.0 | $ 0.9

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