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Goodwill and Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets [Text Block]
GOODWILL AND INTANGIBLE ASSETS

The aggregate carrying amount of goodwill was $131.2 million as of March 31, 2017, and December 31, 2016. There have been no changes to goodwill by reportable segment for the three months ended March 31, 2017.

Balances of intangible assets, net, excluding goodwill as of March 31, 2017, are as follows:
 
December 31,
2016

 Amortization
March 31,
2017

Millions
 
 
 
Intangible Assets
 
 
 
Definite-Lived Intangible Assets
 
 
 
Customer Relationships
$59.3
$(1.1)

$58.2

Developed Technology and Other (a)
6.3
(0.3)
6.0

Total Definite-Lived Intangible Assets
65.6

(1.4)
64.2

Indefinite-Lived Intangible Assets
 
 
 
Trademarks and Trade Names
16.6

n/a
16.6

Total Intangible Assets

$82.2

$(1.4)

$80.8


(a)
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 March 31, 2017, is approximately 20 years.

Amortization expense of intangible assets was $1.4 million for the three months ended March 31, 2017 ($1.3 million for the three months ended March 31, 2016). Accumulated amortization was $10.7 million as of March 31, 2017 ($9.3 million as of December 31, 2016). The estimated amortization expense for definite‑lived intangible assets for the remainder of 2017 is $4.1 million. Estimated annual amortization expense for definite‑lived intangible assets is $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.