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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets [Text Block]
GOODWILL AND INTANGIBLE ASSETS

The aggregate carrying amount of goodwill was $130.6 million as of June 30, 2016, and December 31, 2015. There have been no changes to goodwill by reportable segment for the six months ended June 30, 2016.

Balances of intangible assets, net, excluding goodwill as of June 30, 2016, are as follows:
 
December 31,
2015

 
 Amortization
 
June 30,
2016

Millions
 
 
 
 
 
Intangible Assets
 
 
 
 
 
Definite-Lived Intangible Assets
 
 
 
 
 
Customer Relationships
$60.8
 
$(2.1)
 

$58.7

Developed Technology and Other (a)
7.2
 
(0.4)
 
6.8

Total Definite-Lived Intangible Assets
68.0

 
(2.5)
 
65.5

Indefinite-Lived Intangible Assets
 
 
 
 
 
Trademarks and Trade Names
16.6

 
n/a
 
16.6

Total Intangible Assets

$84.6

 
$(2.5)
 

$82.1


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

Customer relationships have a remaining useful life of approximately 22 years and developed technology and other have remaining useful lives ranging from approximately 3 years to approximately 13 years (weighted average of approximately 8 years). The weighted average remaining useful life of all definite-lived intangible assets as of June 30, 2016, is approximately 20 years.

Amortization expense of intangible assets for the six months ended June 30, 2016, was $2.5 million. Accumulated amortization was $6.6 million as of June 30, 2016 ($4.1 million as of December 31, 2015). The estimated amortization expense for definite-lived intangible assets for the remainder of 2016 is $2.6 million. Estimated annual amortization expense for definite-lived intangible assets is $5.0 million in 2017, $4.7 million in 2018, $4.4 million in 2019, $4.2 million in 2020 and $44.6 million thereafter.