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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating Revenue [Abstract]        
Utility $ 277.6 $ 253.3 $ 824.1 $ 740.5
Non-utility 84.9 96.3 257.3 257.7
Total Operating Revenue 362.5 349.6 1,081.4 998.2
Operating Expenses [Abstract]        
Fuel, Purchased Power and Gas – Utility 93.5 91.7 283.2 250.6
Transmission Services – Utility 18.9 16.6 53.1 49.5
Cost of Sales – Non-utility 36.1 45.7 106.1 108.5
Operating and Maintenance 80.0 80.8 248.2 240.9
Depreciation and Amortization 50.9 48.9 151.5 145.7
Taxes Other than Income Taxes 14.1 12.5 42.7 40.6
Total Operating Expenses 293.5 296.2 884.8 835.8
Operating Income 69.0 53.4 196.6 162.4
Other Income (Expense) [Abstract]        
Interest Expense (16.6) (18.7) (50.5) (53.0)
Equity Earnings in ATC 5.9 6.1 17.3 15.0
Other 0.8 1.2 2.0 2.8
Total Other Expense (9.9) (11.4) (31.2) (35.2)
Income Before Non-Controlling Interest and Income Taxes 59.1 42.0 165.4 127.2
Income Tax Expense 14.2 1.7 34.6 15.7
Net Income 44.9 40.3 130.8 111.5
Less: Non-Controlling Interest in Subsidiaries 0.0 0.0 0.0 0.5
Net Income Attributable to ALLETE $ 44.9 $ 40.3 $ 130.8 $ 111.0
Average Shares of Common Stock [Abstract]        
Basic (Shares) 51.0 49.4 50.7 49.3
Diluted (Shares) 51.2 49.5 50.9 49.4
Basic Earnings Per Share of Common Stock $ 0.88 $ 0.82 $ 2.58 $ 2.25
Diluted Earnings Per Share of Common Stock 0.88 0.81 2.57 2.25
Dividends Per Share of Common Stock $ 0.535 $ 0.52 $ 1.605 $ 1.56