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Consilidated Statement of Income (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Revenue      
Operating Revenue $ 928.2 $ 907.0 $ 766.7
Prior Year Rate Refunds 0 0 (7.6)
Total Operating Revenue 928.2 907.0 759.1
Operating Expenses      
Fuel and Purchased Power 306.6 325.1 279.5
Operating and Maintenance 381.2 365.6 308.9
Depreciation 90.4 80.5 64.7
Total Operating Expenses 778.2 771.2 653.1
Operating Income 150.0 135.8 106.0
Other Income (Expense)      
Interest Expense (43.6) (39.2) (33.8)
Equity Earnings in ATC 18.4 17.9 17.5
Other 4.4 4.6 1.8
Total Other Expense (20.8) (16.7) (14.5)
Income Before Non-Controlling Interest and Income Taxes 129.2 119.1 91.5
Income Tax Expense 35.6 44.3 30.8
Net Income 93.6 74.8 60.7
Less: Non-Controlling Interest in Subsidiaries (0.2) (0.5) (0.3)
Net Income Attributable to ALLETE $ 93.8 $ 75.3 $ 61.0
Average Shares of Common Stock      
Basic (in shares) 35.3 34.2 32.2
Diluted (in shares) 35.4 34.3 32.2
Basic Earnings Per Share of Common Stock $ 2.66 $ 2.20 $ 1.89
Diluted Earnings Per Share of Common Stock $ 2.65 $ 2.19 $ 1.89
Dividends Per Share of Common Stock (in dollars per share) $ 1.78 $ 1.76 $ 1.76