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Investments (Tables)
 12 Months Ended
Dec. 31, 2013
Investments [Abstract]  
Other Investments and ALLETE Properties [Table Text Block]
Other Investments
 
 
As of December 31
2013

2012

Millions
 
 
ALLETE Properties

$89.9


$91.1

Available-for-sale Securities (a)
17.7

26.8

Cash Equivalents
34.2

20.7

Other
4.5

4.9

Total Other Investments

$146.3


$143.5

(a)
As of December 31, 2013, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.6 million, in one year to less than three years was $4.7 million, in three years to less than five years was $2.0 million, and in five or more years was $2.5 million.

ALLETE Properties
December 31, 2013

December 31, 2012

Millions
 
 
Land Inventory Beginning Balance

$86.5


$86.0

Cost of Sales
(1.5
)
(0.2
)
Other
0.4

0.7

Land Inventory Ending Balance
85.4

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

$89.9


$91.1
Available-for-sale Securities [Table Text Block]
Available-For-Sale Securities
Millions
 
Gross Unrealized
 
As of December 31
Cost
Gain
(Loss)
Fair Value
2013
$18.3
—
$(0.6)
$17.7
2012
$27.4
$0.5
$(1.1)
$26.8
2011
$27.3
$0.1
$(2.7)
$24.7
Available-for-sale Securities [Table Text Block]
 
Net
Gross Realized
Net Unrealized
Gain (Loss) in Other
Year Ended December 31
Proceeds
Gain
(Loss)
Comprehensive Income
2013
$16.1
$2.2
—
—
2012
$1.5
—
—
$1.2
2011
$7.8
—
—
$(0.3)