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Common Stock and Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
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, 2008
32,585


$534.1

Employee Stock Purchase Program
24

0.7

Invest Direct
456

13.6

Options and Stock Awards
8

1.1

Equity Issuance Program
1,685

51.9

Contributions to Pension
463

12.0

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
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
 
 
 
2011
 
 
 
Net Income Attributable to ALLETE

$93.8




$93.8

Common Shares
35.3

0.1

35.4

Per Share of Common Stock

$2.66




$2.65

2010
 
 
 
Net Income Attributable to ALLETE

$75.3




$75.3

Common Shares
34.2

0.1

34.3

Per Share of Common Stock

$2.20




$2.19

2009
 
 
 
Net Income Attributable to ALLETE

$61.0




$61.0

Common Shares
32.2

—

32.2

Per Share of Common Stock

$1.89




$1.89