Investments (Tables)

12 Months Ended

Dec. 31, 2014

Investments [Abstract]

Other Investments and ALLETE Properties [Table Text Block]

Other Investments
As of December 31	2014		2013
Millions
ALLETE Properties		$88.2		$89.9
Available-for-sale Securities (a)	18.9		17.7
Cash Equivalents (b)	2.9		34.2
Other	4.4		4.5
Total Other Investments		$114.4		$146.3

(a) As of December 31, 2014, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.6 million, in one year to less than three years was $1.7 million, in three years to less than five years was $2.6 million, and in five or more years was $5.9 million.

(b) During 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.

ALLETE Properties
As of December 31	2014			2013
Millions
Land Inventory Beginning Balance		$85.4			$86.5
Cost of Sales	(2.2		)	(1.5		)
Other	0.6			0.4
Land Inventory Ending Balance	83.8			85.4
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6)	1.2			1.4
Other	3.2			3.1
Total Real Estate Assets		$88.2			$89.9

Available-for-sale Securities [Table Text Block]

Available-For-Sale Securities
Millions		Gross Unrealized
As of December 31	Cost	Gain	Loss	Fair Value
2014	$19.6	$0.2	$0.9	$18.9
2013	$18.3	—	$0.6	$17.7
2012	$27.4	$0.5	$1.1	$26.8
		Net	Gross Realized
Year Ended December 31		Proceeds	Gain	Loss
2014		$3.6	$0.2	—
2013		$16.1	$2.2	—
2012		$1.5	—	—

Available-for-sale Securities [Table Text Block]

Available-For-Sale Securities
Millions		Gross Unrealized
As of December 31	Cost	Gain	Loss	Fair Value
2014	$19.6	$0.2	$0.9	$18.9
2013	$18.3	—	$0.6	$17.7
2012	$27.4	$0.5	$1.1	$26.8
		Net	Gross Realized
Year Ended December 31		Proceeds	Gain	Loss
2014		$3.6	$0.2	—
2013		$16.1	$2.2	—
2012		$1.5	—	—