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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Revenue [Abstract]      
Utility $ 1,063.8 $ 1,000.7 $ 991.2
Non-utility 355.5 339.0 495.2
Total Operating Revenue 1,419.3 1,339.7 1,486.4
Operating Expenses [Abstract]      
Fuel, Purchased Power and Gas - Utility 396.9 339.9 336.0
Transmission Services - Utility 71.2 65.2 54.1
Cost of Sales - Non-utility 147.8 137.7 294.4
Operating and Maintenance 339.9 334.1 333.5
Depreciation and Amortization 177.5 195.8 170.0
Taxes Other Than Income Taxes 56.9 53.8 51.4
Other (0.7) (10.3) 36.3
Total Operating Expenses 1,189.5 1,116.2 1,275.7
Operating Income 229.8 223.5 210.7
Other Income (Expense) [Abstract]      
Interest Expense (67.8) (70.3) (64.9)
Equity Earnings in ATC 22.5 18.5 16.3
Other 2.4 3.9 4.7
Total Other Expense (42.9) (47.9) (43.9)
Income Before Non-Controlling Interest and Income Taxes 186.9 175.6 166.8
Income Tax Expense 14.7 19.8 25.3
Net Income 172.2 155.8 141.5
Less: Non-Controlling Interest in Subsidiaries 0.0 0.5 0.4
Net Income Attributable to ALLETE $ 172.2 $ 155.3 $ 141.1
Average Shares of Common Stock and Per Share Data [Abstract]      
Basic (Shares) 50.8 49.3 48.3
Diluted (Shares) 51.0 49.5 48.4
Basic Earnings Per Share of Common Stock $ 3.39 $ 3.15 $ 2.92
Diluted Earnings Per Share of Common Stock 3.38 3.14 2.92
Dividends Per Share of Common Stock $ 2.14 $ 2.08 $ 2.02