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Schedule I - Short-Term Notes Receivable from Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Notes to parent company financial statements
Short-term notes receivable from related parties	$ 71.0	$ 64.1
UMERC
Notes to parent company financial statements
Short-term notes receivable from related parties	42.5	38.1
Wispark
Notes to parent company financial statements
Short-term notes receivable from related parties	$ 28.5	$ 26.0

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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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