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Acquisition (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Feb. 11, 2014
Jan. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Armenia Mountain [Member]
MW
Jan. 30, 2014
Armenia Mountain [Member]
Sep. 30, 2014
Lake Benton [Member]
MW
Sep. 30, 2014
Storm Lake [Member]
MW
Sep. 30, 2014
Condon [Member]
MW
Business Acquisition [Line Items]                    
Business Acquisition, Effective Date of Acquisition   Jan. 30, 2014                
Business Acquisition, Name of Acquired Entity           Armenia Mountain   Lake Benton Storm Lake Condon
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   $ 26.9                
Generating Capacity (MW)           101   104 77 50
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   90.5 [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                
Purchase option             0.3      
Goodwill   2.9                
Power Purchase Agreements   12.4   12.3 [3] 0 [3]          
Business Combination, Acquisition Related Costs     1.4              
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 6.0                  
[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 relating to 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.