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Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Consolidated Statement of Income [Abstract] |  |  |  |
Operating Revenue | $ 248.8 | $ 226.9 | $ 705.2 | $ 689.0
Operating Expenses [Abstract] |  |  |  |
Fuel and Purchased Power | 79.5 | 74.8 | 228.7 | 229.8
Operating and Maintenance | 98.7 | 90.5 | 294.8 | 276.3
Depreciation | 25.0 | 22.7 | 74.4 | 67.1
Total Operating Expenses | 203.2 | 188.0 | 597.9 | 573.2
Operating Income | 45.6 | 38.9 | 107.3 | 115.8
Other Income (Expense) [Abstract] |  |  |  |
Interest Expense | (12.3) | (10.9) | (33.4) | (32.6)
Equity Earnings in ATC | 4.9 | 4.7 | 14.3 | 13.7
Other | 1.5 | 0.5 | 3.4 | 2.3
Total Other Expense | (5.9) | (5.7) | (15.7) | (16.6)
Income Before Non-Controlling Interest and Income Taxes | 39.7 | 33.2 | 91.6 | 99.2
Income Tax Expense | 10.3 | 12.7 | 23.4 | 24.7
Net Income | 29.4 | 20.5 | 68.2 | 74.5
Less: Non-Controlling Interest in Subsidiaries | 0 | 0 | 0 | (0.2)
Net Income Attributable to ALLETE | $ 29.4 | $ 20.5 | $ 68.2 | $ 74.7
Average Shares of Common Stock [Abstract] |  |  |  |
Basic | 37.7 | 35.6 | 37.3 | 35.1
Diluted | 37.8 | 35.7 | 37.3 | 35.2
Basic Earnings Per Share of Common Stock | $ 0.78 | $ 0.57 | $ 1.83 | $ 2.13
Diluted Earnings Per Share of Common Stock | $ 0.78 | $ 0.57 | $ 1.83 | $ 2.12
Dividends Per Share of Common Stock | $ 0.46 | $ 0.445 | $ 1.38 | $ 1.335

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