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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets [Table Text Block] | Balances of intangible assets, net, excluding goodwill as of June 30, 2017, are as follows:
| December 31, 2016 |  | Amortization | June 30, 2017 |
Millions |  |  |
Intangible Assets |  |  |
Definite-Lived Intangible Assets |  |  |
Customer Relationships | $59.3 | $(2.3) |  | $57.0 |
Developed Technology and Other (a) | 6.3 | (0.5) | 5.8 |
Total Definite-Lived Intangible Assets | 65.6 |  | (2.8) | 62.8 |
Indefinite-Lived Intangible Assets |  |  |
Trademarks and Trade Names | 16.6 |  | n/a | 16.6 |
Total Intangible Assets |  | $82.2 |  | $(2.8) |  | $79.4 |
(a) | Developed Technology and Other includes patents, non-compete agreements and land easements.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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