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Investments (Tables)

9 Months Ended

Sep. 30, 2018

Investments [Abstract]

Other Investments [Table Text Block]

Other Investments	September 30, 2018				December 31, 2017
Millions
ALLETE Properties		$25.4				$26.4
Available-for-sale Securities (a)	21.0				19.1
Cash Equivalents	1.5				3.8
Other	3.8				3.8
Total Other Investments		$51.7				$53.1

(a) As of September 30, 2018, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $1.8 million, in one year to less than three years was $3.5 million, in three years to less than five years was $1.9 million and in five or more years was $1.1 million.

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- Definition

A table of investments, shown as a text block.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 6
-Section 10
-Paragraph (c)
-Subparagraph (1)

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- References

No definition available.

+ Details

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