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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data (Unaudited) [Abstract]

Quarterly Financial Data (Unaudited) [Table Text Block]

Quarter Ended	Mar. 31			Jun. 30			Sept. 30			Dec. 31
Millions Except Earnings Per Share
2011
Operating Revenue		$242.2			$219.9			$226.9			$239.2
Operating Income		$50.8			$26.1			$38.9			$34.2
Net Income Attributable to ALLETE		$37.2			$17.0			$20.5			$19.1
Earnings Per Share of Common Stock
Basic		$1.07			$0.49			$0.57			$0.53
Diluted		$1.07			$0.48			$0.57			$0.53
2010
Operating Revenue		$233.6			$211.2			$224.1			$238.1
Operating Income		$46.1			$31.7			$35.3			$22.7
Net Income Attributable to ALLETE		$23.0			$19.4			$19.6			$13.3
Earnings Per Share of Common Stock
Basic		$0.68			$0.57			$0.57			$0.38
Diluted		$0.68			$0.57			$0.56			$0.38

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- Definition

Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.

+ References

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

-Topic 270

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph (a)-(j)

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306

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