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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 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 June 30, 2018, and $148.3 million as of December 31, 2017. Balances of intangible assets, net, excluding goodwill as of June 30, 2018, are as follows:
| December 31, 2017 |  |  | Additions |  | Amortization |  | June 30, 2018 |
Millions |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |
Definite-Lived Intangible Assets |  |  |  |  |  |  |
Customer Relationships |  | $54.7 |  |  |  | $0.2 |  |  | $(2.1) |  |  | $52.8 |
Developed Technology and Other (a) | 6.3 |  |  | 2.2 |  |  | (0.6) |  | 7.9 |
Total Definite-Lived Intangible Assets | 61.0 |  |  | 2.4 |  |  | (2.7) |  | 60.7 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |
Trademarks and Trade Names | 16.6 |  |  | — |  |  | n/a |  | 16.6 |
Total Intangible Assets |  | $77.6 |  |  |  | $2.4 |  |  | $(2.7) |  |  | $77.3 |
(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 20 years, and developed technology and other have remaining useful lives ranging from approximately 1 year to approximately 11 years (weighted average of approximately 6 years). The weighted average remaining useful life of all definite-lived intangible assets as of June 30, 2018, is approximately 18 years. NOTE 4. GOODWILL AND INTANGIBLE ASSETS (Continued) Amortization expense for intangible assets was $1.3 million and $2.7 million for the quarter and six months ended June 30, 2018, respectively ($1.4 million and $2.8 million for the quarter and six months ended June 30, 2017, respectively). Accumulated amortization was $17.5 million as of June 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 $2.8 million. Estimated annual amortization expense for definite‑lived intangible assets is $5.2 million in 2019, $5.0 million in 2020, $4.9 million in 2021, $4.6 million in 2022 and $38.2 million thereafter.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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