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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets [Text Block]
GOODWILL AND INTANGIBLE ASSETS

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.

NOTE 7.  GOODWILL AND INTANGIBLE ASSETS (Continued)

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.

Customer relationships have a remaining useful life of approximately 21 years, and developed technology and other have remaining useful lives ranging from approximately 2 years to approximately 12 years (weighted average of approximately 8 years). The weighted average remaining useful life of all definite-lived intangible assets as of December 31, 2016, is approximately 20 years.

Amortization expense of intangible assets for the year ended December 31, 2016, was $5.2 million ($4.0 million in 2015; $0.1 million in 2014). Accumulated amortization was $9.3 million and $4.1 million as of December 31, 2016, and December 31, 2015, respectively. Estimated amortization expense for definite-lived intangible assets is $5.5 million in 2017, $5.1 million in 2018, $4.8 million in 2019, $4.5 million in 2020, $4.4 million in 2021 and $41.3 million thereafter.