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Investments (Tables)
 9 Months Ended
Sep. 30, 2014
Investments [Abstract]  
Other Investments and ALLETE Properties [Table Text Block]
Other Investments
September 30,
2014

 
December 31,
2013

Millions
 
 
 
ALLETE Properties

$89.4

 

$89.9

Available-for-sale Securities (a)
19.0

 
17.7

Cash Equivalents (b)
3.7

 
34.2

Other
4.3

 
4.5

Total Other Investments

$116.4

 

$146.3

(a)
As of September 30, 2014, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.2 million, in one year to less than three years was $2.1 million, in three years to less than five years was $1.3 million, and in five or more years was $7.1 million.
(b)
During the first quarter of 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.
NOTE 3.  INVESTMENTS (Continued)

ALLETE Properties
September 30,
2014

 
December 31,
2013

Millions
 
 
 
Land Inventory Beginning Balance

$85.4

 

$86.5

Cost of Sales
(1.1
)
 
(1.5
)
Other
0.5

 
0.4

Land Inventory Ending Balance
84.8

 
85.4

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

 
1.4

Other
3.2

 
3.1

Total Real Estate Assets

$89.4

 

$89.9
Available-for-sale Securities [Table Text Block]
 
 
Gross Unrealized
 
Available-For-Sale Securities
Cost
Gain
Loss
Fair Value
Millions
 
 
 
 
September 30, 2014
$19.1
$0.3
$0.4
$19.0
December 31, 2013
$18.3
—
$0.6
$17.7
Available-for-sale Securities [Table Text Block]
 
Net
Gross Realized
Available-For-Sale Securities (Continued)
Proceeds
Gain
Loss
Millions
 
 
 
Quarter Ended September 30,
 
 
 
2014
$0.6
—
—
2013
$6.9
$1.4
—
Nine Months Ended September 30,
 
 
 
2014
$3.3
$0.2
—
2013
$15.0
$2.2
—