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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Operating Revenue $ 365.6 $ 333.8
Operating Expenses [Abstract]    
Fuel and Purchased Power 93.0 76.9
Transmission Services 16.6 16.8
Cost of Sales 35.2 33.3
Operating and Maintenance 83.3 78.1
Depreciation and Amortization 50.5 48.1
Taxes Other than Income Taxes 14.4 13.8
Total Operating Expenses 293.0 267.0
Operating Income 72.6 66.8
Other Income (Expense) [Abstract]    
Interest Expense (17.2) (16.9)
Equity Earnings in ATC 6.1 4.8
Other 0.6 1.0
Total Other Expense (10.5) (11.1)
Income Before Non-Controlling Interest and Income Taxes 62.1 55.7
Income Tax Expense 13.1 9.3
Net Income 49.0 46.4
Less: Non-Controlling Interest in Subsidiaries 0.0 0.5
Net Income Attributable to ALLETE $ 49.0 $ 45.9
Average Shares of Common Stock and Per Share Data [Abstract]    
Basic (Shares) 50.2 49.2
Diluted (Shares) 50.4 49.2
Basic Earnings Per Share of Common Stock $ 0.97 $ 0.93
Diluted Earnings Per Share of Common Stock 0.97 0.93
Dividends Per Share of Common Stock $ 0.535 $ 0.52