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Investments (Tables)
 6 Months Ended
Jun. 30, 2013
Investments [Abstract]  
Other Investments and ALLETE Properties [Table Text Block]
Other Investments
June 30,
2013

 
December 31,
2012

Millions
 
 
 
ALLETE Properties

$91.1

 

$91.1

Available-for-sale Securities (a)
20.4

 
26.8

Cash Equivalents
24.4

 
20.7

Other
4.3

 
4.9

Total Other Investments

$140.2

 

$143.5

(a)
As of June 30, 2013, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $1.2 million, in one year to less than three years was $5.1 million, in three years to less than five years was $1.3 million, and in five or more years was $0.9 million.

ALLETE Properties
June 30,
2013

 
December 31,
2012

Millions
 
 
 
Land Inventory Beginning Balance

$86.5

 

$86.0

Deeds to Collateralized Property
—

 
0.5

Cost of Sales
—

 
(0.2
)
Capitalized Improvements and Other
0.1

 
0.2

Land Inventory Ending Balance
86.6

 
86.5

Long-Term Finance Receivables (net of allowances of $0.6 and $0.6)
1.4

 
1.4

Other
3.1

 
3.2

Total Real Estate Assets

$91.1

 

$91.1