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SUBSEQUENT EVENT (Details) (Upper Peninsula Power Company, Inc., Electric, USD $)
In Millions, unless otherwise specified
Jan. 31, 2014
Dec. 31, 2013
Disclosures related to the disposal    
Expected proceeds from sale $ 298.8  
Balances of the assets and liabilities included in the disposal group    
Current assets   26.5
Property, plant, and equipment, net of accumulated depreciation   193.8
Accumulated depreciation   88.9
Other long-term assets   51.5
Total assets   271.8
Current liabilities   21.2
Long-term liabilities   32.4
Total liabilities   $ 53.6
Minimum
   
Disclosures related to the disposal    
Transition period for administrative and operational services 18 months  
Maximum
   
Disclosures related to the disposal    
Transition period for administrative and operational services 30 months