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Operations and Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jan. 30, 2014
Dec. 31, 2013
Inventories [Abstract]        
Fuel $ 22.9     $ 13.1
Materials and Supplies 52.4     46.2
Total Inventories 75.3     59.3
Prepayments and Other Current Assets [Abstract]        
Deferred Fuel Adjustment Clause 20.3     23.0
Restricted Cash 3.3 [1]     0 [1]
Other 8.6     12.1
Total Prepayments and Other Current Assets 32.2     35.1
Other Non-Current Assets [Abstract]        
Restricted Cash 4.9     5.4
Other Current Liabilites [Abstract]        
Customer Deposits 22.8     26.0
Power Purchase Agreements 12.7 [2]   12.4 0 [2]
Other 25.6     26.6
Total Other Current Liabilities 61.1     52.6
Other Non-Current Liabilities [Abstract]        
Asset Retirement Obligation 93.0     81.8
Power Purchase Agreements 93.4 [2]   99.4 0 [2]
Other 48.1     45.4
Total Other Non-Current Liabilities 234.5     127.2
Supplemental Statement of Cash Flows Information [Abstract]        
Cash Paid During the Period for Interest - Net of Amounts Capitalized 23.7 22.8    
Cash Paid During the Period for Income Taxes 0.2 0.6    
Noncash Investing and Financing Activities [Abstract]        
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment 3.6 (28.2)    
Capitalized Asset Retirement Costs 0.6 1.9    
AFUDC - Equity 3.8 2.1    
ALLETE Common Stock Contributed to the Pension Plan $ 19.5 $ 0    
[1] Restricted Cash related to ALLETE Clean Energy’s wind energy facilities operating expense and capital distribution reserve requirements.
[2] Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisition on January 30, 2014 (see Note 4. Acquisition).