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Acquisition (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 6 Months Ended
Feb. 11, 2014
Jan. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Business Acquisition, Effective Date of Acquisition   Jan. 30, 2014    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   $ 26.9    
Assets [Abstract]        
Cash and Cash Equivalents   3.8    
Other Current Assets   14.3    
Property, Plant and Equipment - Net   156.9    
Other Non-Current Assets   7.5 [1]    
Total Assets Acquired   182.5    
Liabilities [Abstract]        
Other Current Liabilities   15.2 [2]    
Long-term Debt Due Within One Year   2.2    
Long-term Debt   21.1    
Power Purchase Agreements   99.4 93.4 [3] 0 [3]
Other Non-Current Liabilities   10.6    
Non-Controlling Interest   7.1 [4]    
Total Liabilities and Non-Controlling Interest Assumed   155.6    
Net Identifiable Assets Acquired   26.9    
Power Purchase Agreements   12.4 12.7 [3] 0 [3]
Business Combination, Acquisition Related Costs     1.4  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests 6.0      
Armenia Mountain [Member]
        
Business Acquisition [Line Items]        
Business Acquisition, Name of Acquired Entity     Armenia Mountain  
Generating Capacity (MW)     101  
Liabilities [Abstract]        
Purchase option   0.3    
Goodwill   $ 2.9    
Lake Benton [Member]
        
Business Acquisition [Line Items]        
Business Acquisition, Name of Acquired Entity     Lake Benton  
Generating Capacity (MW)     104  
Storm Lake [Member]
        
Business Acquisition [Line Items]        
Business Acquisition, Name of Acquired Entity     Storm Lake  
Generating Capacity (MW)     77  
Condon [Member]
        
Business Acquisition [Line Items]        
Business Acquisition, Name of Acquired Entity     Condon  
Generating Capacity (MW)     50  
[1] Included in Other Non-Current Assets was $0.3 million for the option to purchase Armenia Mountain in 2015, and goodwill of $2.9 million; for tax purposes, the purchase price allocation resulted in no allocation to goodwill.
[2] Other Current Liabilities included $12.4 million related to the current liabilities portion of the Power Purchase Agreements.
[3] Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisition on January 30, 2014 (see Note 4. Acquisition).
[4] The purchase price accounting valued the non-controlling interest of Lake Benton, Storm Lake and Condon at fair value using the discounted cash flow method. The non-controlling interest related to Lake Benton and Storm Lake was subsequently purchased by ALLETE Clean Energy.