XML 43 R25.htm IDEA: XBRL DOCUMENT

Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

Other Investments [Table Text Block]



Other Investments	March 31, 2018				December 31, 2017
Millions
ALLETE Properties		$26.0				$26.4
Available-for-sale Securities (a)	21.1				19.1
Cash Equivalents	2.0				3.8
Other	3.7				3.8
Total Other Investments		$52.8				$53.1


(a)	As of March 31, 2018, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $0.9 million, in one year to less than three years was $3.4 million, in three years to less than five years was $3.3 million and in five or more years was $1.1 million.