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Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Operating Revenue $ 1,339.7 $ 1,486.4 $ 1,136.8
Operating Expenses [Abstract]      
Fuel and Purchased Power 332.9 328.1 356.1
Transmission Services 65.2 54.1 45.6
Cost of Sales 144.7 302.3 77.9
Operating and Maintenance 334.1 333.5 287.1
Depreciation and Amortization 195.8 170.0 135.7
Taxes Other Than Income Taxes 53.8 51.4 45.6
Other (10.3) 36.3 0.0
Total Operating Expenses 1,116.2 1,275.7 948.0
Operating Income 223.5 210.7 188.8
Other Income (Expense) [Abstract]      
Interest Expense (70.3) (64.9) (54.8)
Equity Earnings in ATC 18.5 16.3 19.6
Other 3.9 4.7 8.6
Total Other Expense (47.9) (43.9) (26.6)
Income Before Non-Controlling Interest and Income Taxes 175.6 166.8 162.2
Income Tax Expense 19.8 25.3 36.7
Net Income 155.8 141.5 125.5
Less: Non-Controlling Interest in Subsidiaries 0.5 0.4 0.7
Net Income Attributable to ALLETE $ 155.3 $ 141.1 $ 124.8
Average Shares of Common Stock and Per Share Data [Abstract]      
Basic (Shares) 49.3 48.3 42.9
Diluted (Shares) 49.5 48.4 43.1
Basic Earnings Per Share of Common Stock $ 3.15 $ 2.92 $ 2.91
Diluted Earnings Per Share of Common Stock 3.14 2.92 2.90
Dividends Per Share of Common Stock $ 2.08 $ 2.02 $ 1.96