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Investments (Tables)

12 Months Ended

Dec. 31, 2015

Investments [Abstract]

Other Investments [Table Text Block]



Other Investments
As of December 31	2015			2014
Millions
ALLETE Properties (a)		$50.1			$88.2
Available-for-sale Securities (b)	18.5			18.9
Cash Equivalents	2.0			2.9
Other	4.0			4.4
Total Other Investments		$74.6			$114.4


(a)	In 2015, ALLETE Properties recorded a $36.3 million non-cash impairment charge related to its real estate assets. (See Note 1. Operations and Significant Accounting Policies.)


(b)	As of December 31, 2015, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was none, in one year to less than three years was $1.0 million, in three years to less than five years was $3.2 million, and in five or more years was $6.7 million.

Available-for-sale Securities [Table Text Block]



Available-For-Sale Securities
Millions		Gross Unrealized
As of December 31	Cost	Gain	Loss	Fair Value
2015	$20.0	—	$1.5	$18.5
2014	$19.6	$0.2	$0.9	$18.9
2013	$18.3	—	$0.6	$17.7
		Net	Gross Realized
Year Ended December 31		Proceeds	Gain	Loss
2015		$1.7	$0.1	—
2014		$3.6	$0.2	—
2013		$16.1	$2.2	—

Available-for-sale Securities [Table Text Block]



Available-For-Sale Securities
Millions		Gross Unrealized
As of December 31	Cost	Gain	Loss	Fair Value
2015	$20.0	—	$1.5	$18.5
2014	$19.6	$0.2	$0.9	$18.9
2013	$18.3	—	$0.6	$17.7
		Net	Gross Realized
Year Ended December 31		Proceeds	Gain	Loss
2015		$1.7	$0.1	—
2014		$3.6	$0.2	—
2013		$16.1	$2.2	—