XML 38 R25.htm IDEA: XBRL DOCUMENT v3.5.0.2
Investments (Tables)
 6 Months Ended
Jun. 30, 2016
Investments [Abstract]  
Other Investments [Table Text Block]
Other Investments
June 30,
2016

 
December 31,
2015

Millions
 
 
 
ALLETE Properties

$47.8

 

$50.1

Available-for-sale Securities (a)
18.4

 
18.5

Cash Equivalents
2.3

 
2.0

Other
3.8

 
4.0

Total Other Investments

$72.3

 

$74.6

(a)
As of June 30, 2016, 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 $2.5 million, in three years to less than five years was $5.0 million, and in five or more years was $3.3 million.