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Consolidated Statement of Income (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statement of Income [Abstract]        
Operating Revenue $ 248.8 $ 226.9 $ 705.2 $ 689.0
Operating Expenses [Abstract]        
Fuel and Purchased Power 79.5 74.8 228.7 229.8
Operating and Maintenance 98.7 90.5 294.8 276.3
Depreciation 25.0 22.7 74.4 67.1
Total Operating Expenses 203.2 188.0 597.9 573.2
Operating Income 45.6 38.9 107.3 115.8
Other Income (Expense) [Abstract]        
Interest Expense (12.3) (10.9) (33.4) (32.6)
Equity Earnings in ATC 4.9 4.7 14.3 13.7
Other 1.5 0.5 3.4 2.3
Total Other Expense (5.9) (5.7) (15.7) (16.6)
Income Before Non-Controlling Interest and Income Taxes 39.7 33.2 91.6 99.2
Income Tax Expense 10.3 12.7 23.4 24.7
Net Income 29.4 20.5 68.2 74.5
Less: Non-Controlling Interest in Subsidiaries 0 0 0 (0.2)
Net Income Attributable to ALLETE $ 29.4 $ 20.5 $ 68.2 $ 74.7
Average Shares of Common Stock [Abstract]        
Basic 37.7 35.6 37.3 35.1
Diluted 37.8 35.7 37.3 35.2
Basic Earnings Per Share of Common Stock $ 0.78 $ 0.57 $ 1.83 $ 2.13
Diluted Earnings Per Share of Common Stock $ 0.78 $ 0.57 $ 1.83 $ 2.12
Dividends Per Share of Common Stock $ 0.46 $ 0.445 $ 1.38 $ 1.335