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Consilidated Statement of Income (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Revenue $ 961.2 $ 928.2 $ 907.0
Operating Expenses      
Fuel and Purchased Power 308.7 306.6 325.1
Operating and Maintenance 397.1 381.2 365.6
Depreciation 100.2 90.4 80.5
Total Operating Expenses 806.0 778.2 771.2
Operating Income 155.2 150.0 135.8
Other Income (Expense)      
Interest Expense (45.5) (43.6) (39.2)
Equity Earnings in ATC 19.4 18.4 17.9
Other 6.0 4.4 4.6
Total Other Expense (20.1) (20.8) (16.7)
Income Before Non-Controlling Interest and Income Taxes 135.1 129.2 119.1
Income Tax Expense 38.0 35.6 44.3
Net Income 97.1 93.6 74.8
Less: Non-Controlling Interest in Subsidiaries 0 (0.2) (0.5)
Net Income Attributable to ALLETE $ 97.1 $ 93.8 $ 75.3
Average Shares of Common Stock      
Basic (in shares) 37.6 35.3 34.2
Diluted (in shares) 37.6 35.4 34.3
Basic Earnings Per Share of Common Stock $ 2.59 $ 2.66 $ 2.20
Diluted Earnings Per Share of Common Stock $ 2.58 $ 2.65 $ 2.19
Dividends Per Share of Common Stock $ 1.84 $ 1.78 $ 1.76