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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Operating Revenue $ 314.8 $ 323.3 $ 648.6 $ 643.3
Operating Expenses [Abstract]        
Fuel and Purchased Power 78.1 80.1 155.0 166.1
Transmission Services 16.1 11.3 32.9 26.2
Cost of Sales 33.4 52.3 66.7 83.5
Operating and Maintenance 82.0 85.4 160.1 165.1
Depreciation and Amortization 48.7 41.3 96.8 80.3
Taxes Other than Income Taxes 14.3 13.4 28.1 26.2
Total Operating Expenses 272.6 283.8 539.6 547.4
Operating Income 42.2 39.5 109.0 95.9
Other Income (Expense) [Abstract]        
Interest Expense (17.4) (16.2) (34.3) (31.3)
Equity Earnings in ATC 4.1 4.7 8.9 8.6
Other 0.6 0.7 1.6 1.8
Total Other Expense (12.7) (10.8) (23.8) (20.9)
Income Before Non-Controlling Interest and Income Taxes 29.5 28.7 85.2 75.0
Income Tax Expense 4.7 6.4 14.0 12.6
Net Income 24.8 22.3 71.2 62.4
Less: Non-Controlling Interest in Subsidiaries 0.0 (0.2) 0.5 0.0
Net Income Attributable to ALLETE $ 24.8 $ 22.5 $ 70.7 $ 62.4
Average Shares of Common Stock and Per Share Data [Abstract]        
Basic (in shares) 49.3 48.6 49.2 47.7
Diluted (in shares) 49.5 48.7 49.3 47.8
Basic Earnings Per Share of Common Stock $ 0.50 $ 0.46 $ 1.44 $ 1.31
Diluted Earnings Per Share of Common Stock 0.50 0.46 1.43 1.30
Dividends Per Share of Common Stock $ 0.52 $ 0.505 $ 1.04 $ 1.01