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Schedule I - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Notes to parent company financial statements      
Cash received (paid) for income taxes, net $ (16.3) $ 5.2 $ 39.7
WEC Energy Group      
Notes to parent company financial statements      
Cash (paid) for interest (102.9) (82.5) (89.6)
Cash received (paid) for income taxes, net 85.9 169.9 (62.9)
WEC Energy Group | Bluewater      
Notes to parent company financial statements      
Issuance of short-term note receivable 0.0 115.0 0.0
WEC Energy Group | UMERC      
Notes to parent company financial statements      
Issuance of short-term note receivable 0.0 40.5 0.0
WEC Energy Group | Bostco      
Notes to parent company financial statements      
Settlement of short-term note payable 0.0 4.8 0.0
WEC Energy Group | Wisvest      
Notes to parent company financial statements      
Settlement of short-term note payable $ 0.9 $ 0.0 $ 40.0