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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets [Text Block] GOODWILL AND INTANGIBLE ASSETS

The aggregate carrying amount of goodwill was $148.5 million as of September 30, 2018, and $148.3 million as of December 31, 2017.

Balances of intangible assets, net, excluding goodwill as of September 30, 2018, are as follows:
 
December 31,
2017

 
Additions
 
 Amortization
 
September 30,
2018

Millions
 
 
 
 
 
 
 
Intangible Assets
 
 
 
 
 
 
 
Definite-Lived Intangible Assets
 
 
 
 
 
 
 
Customer Relationships

$54.7

 

$0.2

 
$(3.2)
 

$51.7

Developed Technology and Other (a)
6.3

 
2.5

 
(0.9)
 
7.9

Total Definite-Lived Intangible Assets
61.0

 
2.7

 
(4.1)
 
59.6

Indefinite-Lived Intangible Assets
 
 
 
 
 
 
 
Trademarks and Trade Names
16.6

 
—

 
n/a
 
16.6

Total Intangible Assets

$77.6

 

$2.7

 
$(4.1)
 

$76.2


(a)
Developed Technology and Other includes patents, non-compete agreements, land easements and trade names with finite lives.

Customer relationships have a remaining useful life of approximately 19 years, and developed technology and other have remaining useful lives ranging from less than 1 year to approximately 10 years (weighted average of approximately 6 years). The weighted average remaining useful life of all definite-lived intangible assets as of September 30, 2018, is approximately 18 years.
NOTE 4. GOODWILL AND INTANGIBLE ASSETS (Continued)

Amortization expense for intangible assets was $1.4 million and $4.1 million for the quarter and nine months ended September 30, 2018, respectively ($1.3 million and $4.1 million for the quarter and nine months ended September 30, 2017, respectively). Accumulated amortization was $18.9 million as of September 30, 2018 ($14.8 million as of December 31, 2017). The estimated amortization expense for definite-lived intangible assets for the remainder of 2018 is $1.5 million. Estimated annual amortization expense for definite‑lived intangible assets is $5.3 million in 2019, $4.9 million in 2020, $4.9 million in 2021, $4.6 million in 2022 and $38.4 million thereafter.