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Common Stock and Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Common Stock and Earnings Per Share [Abstract]

Summary of Common Stock [Table Text Block]



Summary of Common Stock	Shares		Equity
	Thousands		Millions
Balance as of December 31, 2009	35,221			$613.4
Employee Stock Purchase Program	19		0.6
Invest Direct	346		11.7
Options and Stock Awards	51		4.4
Equity Issuance Program	180		6.0
Balance as of December 31, 2010	35,817			$636.1
Employee Stock Purchase Program	20		0.8
Invest Direct	437		17.2
Options and Stock Awards	109		6.7
Equity Issuance Program	400		16.0
Purchase of Non-Controlling Interest	222		8.8
Contributions to Pension	508		20.0
Balance as of December 31, 2011	37,513			$705.6
Employee Stock Purchase Program	20		0.8
Invest Direct	474		19.2
Options and Stock Awards	95		6.0
Equity Issuance Program	1,275		53.1
Balance as of December 31, 2012	39,377			$784.7

Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block]



Reconciliation of Basic and Diluted
Earnings Per Share				Dilutive
Year Ended December 31	Basic			Securities		Diluted
Millions Except Per Share Amounts
2012
Net Income Attributable to ALLETE		$97.1					$97.1
Average Common Shares	37.6			—		37.6
Earnings Per Share		$2.59					$2.58
2011
Net Income Attributable to ALLETE		$93.8					$93.8
Average Common Shares	35.3			0.1		35.4
Earnings Per Share		$2.66					$2.65
2010
Net Income Attributable to ALLETE		$75.3					$75.3
Average Common Shares	34.2			0.1		34.3
Earnings Per Share		$2.20					$2.19