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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Consolidated Statement of Income [Abstract]        
Operating Revenue $ 288.9 $ 251.0 $ 846.1 $ 750.4
Operating Expenses [Abstract]        
Fuel and Purchased Power 88.9 80.5 268.7 245.7
Operating and Maintenance 105.7 102.7 340.6 311.2
Depreciation 33.5 29.4 99.5 86.3
Total Operating Expenses 228.1 212.6 708.8 643.2
Operating Income 60.8 38.4 137.3 107.2
Other Income (Expense) [Abstract]        
Interest Expense (13.2) (12.7) (39.5) (37.8)
Equity Earnings in ATC 5.3 4.9 15.6 15.1
Other 2.1 3.3 6.0 7.5
Total Other Expense (5.8) (4.5) (17.9) (15.2)
Income Before Non-Controlling Interest and Income Taxes 55.0 33.9 119.4 92.0
Income Tax Expense 13.4 8.7 27.1 20.3
Net Income 41.6 25.2 92.3 71.7
Less: Non-Controlling Interest in Subsidiaries 0 0 0.4 0
Net Income Attributable to ALLETE $ 41.6 $ 25.2 $ 91.9 $ 71.7
Average Shares of Common Stock and Per Share Data [Abstract]        
Basic (in shares) 42.9 39.8 42.1 39.4
Diluted (in shares) 42.9 39.9 42.3 39.5
Basic Earnings Per Share of Common Stock $ 0.97 $ 0.63 $ 2.18 $ 1.82
Diluted Earnings Per Share of Common Stock $ 0.97 $ 0.63 $ 2.17 $ 1.81
Dividends Per Share of Common Stock $ 0.49 $ 0.475 $ 1.47 $ 1.425