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Schedule I - Short-Term Notes Payable to Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Notes to parent company financial statements |  |
Short-term notes payable to related parties | $ 241.3 | $ 119.0
WBS |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | 131.1 | 0.0
WECC |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | 109.3 | 108.4
Wisvest |  |
Notes to parent company financial statements |  |
Short-term notes payable to related parties | $ 0.9 | $ 10.6

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