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Investments (Tables)
 3 Months Ended
Mar. 31, 2017
Investments [Abstract]  
Other Investments [Table Text Block]
Other Investments
March 31,
2017

 
December 31,
2016

Millions
 
 
 
ALLETE Properties

$31.6

 

$31.7

Available-for-sale Securities (a)
19.6

 
18.8

Cash Equivalents
2.6

 
1.3

Other
3.9

 
3.8

Total Other Investments

$57.7

 

$55.6


(a)
As of March 31, 2017, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $0.2 million, in one year to less than three years was $3.0 million, in three years to less than five years was $5.0 million and in five or more years was $3.9 million.