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Earnings Per Share and Common Stock (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

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

					2011											2010
Reconciliation of Basic and Diluted					Dilutive											Dilutive
Earnings Per Share	Basic				Securities			Diluted				Basic				Securities			Diluted
Millions Except Per Share Amounts
For the Quarter Ended September 30,
Net Income Attributable to ALLETE		$20.5							$20.5				$19.6							$19.6
Common Shares	35.6				0.1			35.7				34.4				0.1			34.5
Earnings Per Share		$0.57							$0.57				$0.57							$0.56
For the Nine Months Ended September 30,
Net Income Attributable to ALLETE		$74.7							$74.7				$62.0							$62.0
Common Shares	35.1				0.1			35.2				34.1				0.1			34.2
Earnings Per Share		$2.13							$2.12				$1.82							$1.81

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- Definition

Tabular disclosure of the reconciliation of basic net earnings per share (or unit) to diluted earnings per share (or unit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 260

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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