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Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Consolidated Statement of Income [Abstract] |  |  |  |
Operating Revenue | $ 216.4 | $ 219.9 | $ 456.4 | $ 462.1
Operating Expenses [Abstract] |  |  |  |
Fuel and Purchased Power | 72.1 | 76.0 | 149.2 | 155.0
Operating and Maintenance | 96.2 | 95.7 | 196.1 | 185.8
Depreciation | 24.8 | 22.1 | 49.4 | 44.4
Total Operating Expenses | 193.1 | 193.8 | 394.7 | 385.2
Operating Income | 23.3 | 26.1 | 61.7 | 76.9
Other Income (Expense) [Abstract] |  |  |  |
Interest Expense | (10.1) | (11.0) | (21.1) | (21.7)
Equity Earnings in ATC | 4.8 | 4.6 | 9.4 | 9.0
Other | 1.2 | 1.0 | 1.9 | 1.8
Total Other Expense | (4.1) | (5.4) | (9.8) | (10.9)
Income Before Non-Controlling Interest and Income Taxes | 19.2 | 20.7 | 51.9 | 66.0
Income Tax Expense | 4.8 | 3.8 | 13.1 | 12.0
Net Income | 14.4 | 16.9 | 38.8 | 54.0
Less: Non-Controlling Interest in Subsidiaries | 0 | (0.1) | 0 | (0.2)
Net Income Attributable to ALLETE | $ 14.4 | $ 17.0 | $ 38.8 | $ 54.2
Average Shares of Common Stock [Abstract] |  |  |  |
Basic | 37.3 | 35.0 | 37.0 | 34.8
Diluted | 37.4 | 35.1 | 37.1 | 34.9
Basic Earnings Per Share of Common Stock | $ 0.39 | $ 0.49 | $ 1.05 | $ 1.56
Diluted Earnings Per Share of Common Stock | $ 0.39 | $ 0.48 | $ 1.05 | $ 1.55
Dividends Per Share of Common Stock | $ 0.46 | $ 0.445 | $ 0.92 | $ 0.89

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