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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets [Table Text Block] | 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.

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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