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Consolidated Statement of Income (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Operating Revenue $ 260.7 $ 235.6 $ 557.2 $ 499.4
Operating Expenses [Abstract]        
Fuel and Purchased Power 83.6 78.7 179.8 165.2
Operating and Maintenance 115.1 103.8 234.9 208.5
Depreciation 33.8 28.7 66.0 56.9
Total Operating Expenses 232.5 211.2 480.7 430.6
Operating Income 28.2 24.4 76.5 68.8
Other Income (Expense) [Abstract]        
Interest Expense (13.5) (12.8) (26.3) (25.1)
Equity Earnings in ATC 5.2 5.0 10.3 10.2
Other 1.9 1.5 3.9 4.2
Total Other Expense (6.4) (6.3) (12.1) (10.7)
Income Before Non-Controlling Interest and Income Taxes 21.8 18.1 64.4 58.1
Income Tax Expense 4.9 4.1 13.7 11.6
Net Income 16.9 14.0 50.7 46.5
Less: Non-Controlling Interest in Subsidiaries 0.1 0 0.4 0
Net Income Attributable to ALLETE $ 16.8 $ 14.0 $ 50.3 $ 46.5
Average Shares of Common Stock and Per Share Data [Abstract]        
Basic (in shares) 42.1 39.4 41.7 39.2
Diluted (in shares) 42.3 39.6 41.9 39.3
Basic Earnings Per Share of Common Stock $ 0.40 $ 0.36 $ 1.21 $ 1.19
Diluted Earnings Per Share of Common Stock $ 0.40 $ 0.35 $ 1.20 $ 1.18
Dividends Per Share of Common Stock $ 0.49 $ 0.475 $ 0.98 $ 0.95