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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets [Abstract]  
Goodwill and Intangible Assets [Text Block]
GOODWILL AND INTANGIBLE ASSETS

The following table summarizes changes to goodwill by business segment for the six months ended June 30, 2015:
 
Investments and Other

Millions
 
Balance as of December 31, 2014

$2.9

Acquired Goodwill
127.2

Balance as of June 30, 2015

$130.1



NOTE 5.  GOODWILL AND INTANGIBLE ASSETS (Continued)

Balances of intangible assets, net, excluding goodwill as of June 30, 2015, are as follows:
 
December 31,
2014

 
Additions as a Result of Acquisitions
 
 Amortization
 
June 30,
2015

Millions
 
 
 
 
 
 
 
Intangible Assets
 
 
 
 
 
 
 
Definite-Lived Intangible Assets
 
 
 
 
 
 
 
Customer Relationships

 

$60.1

 

$1.3

 

$58.8

Developed Technology and Other (a)

$1.9

 
6.3

 
0.3

 
7.9

Total Definite-Lived Intangible Assets
1.9

 
66.4

 
1.6

 
66.7

Indefinite-Lived Intangible Assets
 
 
 
 
 
 
 
Trademarks and Trade Names

 
16.6

 
n/a

 
16.6

Total Intangible Assets

$1.9

 

$83.0

 

$1.6

 

$83.3

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

Customer relationships have a useful life of approximately 23 years and developed technology and other have useful lives ranging from less than 1 year to approximately 14 years (weighted average of approximately 9 years). The weighted average useful life of all definite-lived intangible assets as of June 30, 2015 is approximately 21 years.

Amortization expense of intangible assets for the six months ended June 30, 2015, was $1.6 million. The estimated amortization expense for definite-lived intangible assets for the remainder of 2015 is $2.6 million. Estimated annual amortization expense for definite-lived intangible assets is $4.3 million in 2016, $4.2 million in 2017, $4.1 million in 2018, $4.0 million in 2019, and $47.5 million thereafter.