Consilidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Revenue	$ 1,018.4	$ 961.2	$ 928.2
Operating Expenses
Fuel and Purchased Power	334.8	308.7	306.6
Operating and Maintenance	412.9	397.1	381.2
Depreciation	116.6	100.2	90.4
Total Operating Expenses	864.3	806.0	778.2
Operating Income	154.1	155.2	150.0
Other Income (Expense)
Interest Expense	(50.3)	(45.5)	(43.6)
Equity Earnings in ATC	20.3	19.4	18.4
Other	9.3	6.0	4.4
Total Other Expense	(20.7)	(20.1)	(20.8)
Income Before Non-Controlling Interest and Income Taxes	133.4	135.1	129.2
Income Tax Expense	28.7	38.0	35.6
Net Income	104.7	97.1	93.6
Less: Non-Controlling Interest in Subsidiaries	0	0	(0.2)
Net Income Attributable to ALLETE	$ 104.7	$ 97.1	$ 93.8
Average Shares of Common Stock
Basic (in shares)	39.7	37.6	35.3
Diluted (in shares)	39.8	37.6	35.4
Basic Earnings Per Share of Common Stock	$ 2.64	$ 2.59	$ 2.66
Diluted Earnings Per Share of Common Stock	$ 2.63	$ 2.58	$ 2.65
Dividends Per Share of Common Stock	$ 1.90	$ 1.84	$ 1.78