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Schedule I - Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets        
Cash and cash equivalents $ 38.9 $ 37.5 $ 49.8 $ 61.9
Other 74.9 97.5    
Current assets 2,213.5 2,168.7    
Long-term assets        
Investments in subsidiaries 1,553.4 1,443.9    
Other 619.9 461.0    
Long-term assets 29,377.0 27,954.5    
Total assets 31,590.5 30,123.2 29,355.2  
Current liabilities        
Short-term debt 1,444.6 860.2    
Other 553.6 388.9    
Current liabilities 3,869.3 2,431.6    
Long-term liabilities        
Long-term debt 8,746.6 9,158.2    
Other 1,206.3 1,164.4    
Long-term liabilities 18,229.4 18,731.4    
Equity        
Common shareholders' equity 9,491.8 8,960.2 8,685.2 4,450.1
Total liabilities and equity 31,590.5 30,123.2    
WEC Energy Group        
Current assets        
Cash and cash equivalents 4.0 1.2 $ 1.3 $ 37.3
Accounts receivable from related parties 1.9 1.8    
Notes receivable from related parties 64.1 76.4    
Prepaid taxes 17.5 47.6    
Other 0.6 0.5    
Current assets 88.1 127.5    
Long-term assets        
Investments in subsidiaries 12,101.9 11,155.4    
Note receivable from UMERC 50.0 0.0    
Other 47.7 134.7    
Long-term assets 12,199.6 11,290.1    
Total assets 12,287.7 11,417.6    
Current liabilities        
Short-term debt 494.8 321.8    
Current portion of long-term debt 300.0 0.0    
Accounts payable to related parties 2.7 3.2    
Notes payable to related parties 406.0 241.3    
Other 8.9 10.3    
Current liabilities 1,212.4 576.6    
Long-term liabilities        
Long-term debt 1,592.3 1,890.0    
Other 21.6 21.2    
Long-term liabilities 1,613.9 1,911.2    
Equity        
Common shareholders' equity 9,461.4 8,929.8    
Total liabilities and equity $ 12,287.7 $ 11,417.6