Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments [Abstract]

Other Investments and ALLETE Properties [Table Text Block]

Other Investments	September 30, 2013		December 31, 2012
Millions
ALLETE Properties		$91.2		$91.1
Available-for-sale Securities (a)	16.1		26.8
Cash Equivalents	31.2		20.7
Other	4.4		4.9
Total Other Investments		$142.9		$143.5

(a) As of September 30, 2013, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.8 million, in one year to less than three years was $4.8 million, in three years to less than five years was $2.0 million, and in five or more years was $1.3 million.

ALLETE Properties	September 30, 2013		December 31, 2012
Millions
Land Inventory Beginning Balance		$86.5		$86.0
Cost of Sales	—		(0.2		)
Other	0.2		0.7
Land Inventory Ending Balance	86.7		86.5
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6)	1.4		1.4
Other	3.1		3.2
Total Real Estate Assets		$91.2		$91.1