Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

The following table summarizes changes to goodwill by reportable segment:



	ALLETE Clean Energy			U.S. Water Services		Total
Millions
Balance as of December 31, 2014		$2.9		—			$2.9
Acquired Goodwill (a)	0.4				$127.3	127.7
Balance as of December 31, 2015	3.3			127.3		130.6
Acquired Goodwill (a)	—			3.9		3.9
Impairment Charge (b)	(3.3		)	—		(3.3		)
Balance as of December 31, 2016	—				$131.2		$131.2


(a)	See Note 6. Acquisitions.

(b)

The facts and circumstances that led to an impairment of ALLETE Clean Energy’s goodwill primarily relate to lower estimated energy prices in periods not under PSAs. Impairment Charge is included in Operating Expenses – Other on the Consolidated Statement of Income. (See Note 1. Operations and Significant Accounting Policies.) ALLETE Clean Energy’s goodwill was primarily related to the acquisition of Storm Lake II in January 2014.

Schedule of Intangible Assets [Table Text Block]

The following table summarizes changes to intangible assets, net, for the year ended December 31, 2016:



	December 31, 2015		Additions (a)		Amortization	December 31, 2016
Millions
Intangible Assets
Definite-Lived Intangible Assets
Customer Relationships		$60.8		$2.8	$(4.3)		$59.3
Developed Technology and Other (b)	7.2		—		(0.9)	6.3
Total Definite-Lived Intangible Assets	68.0		2.8		(5.2)	65.6
Indefinite-Lived Intangible Assets
Trademarks and Trade Names	16.6		—		n/a	16.6
Total Intangible Assets		$84.6		$2.8	$(5.2)		$82.2


(a)	Additions resulting from the October 11, 2016, acquisition of WEST. (See Note 6. Acquisitions.)


(b)	Developed Technology and Other includes patents, non-compete agreements and land easements.