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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from External Customers by Geographic Areas [Table Text Block] | The following table sets forth revenues by our two primary geographical markets, United States and outside of the United States, based on the geographic location to which we deliver the product (in millions):
| Three Months Ended June 30, 2018 |  | Six Months Ended June 30, 2018
Revenues: |  |  |
United States | $ | 189.6 |  |  | $ | 335.0 |
Outside of the United States | 52.9 |  |  | 91.9 |
Total | $ | 242.5 |  |  | $ | 426.9 |
Disaggregation of Revenue [Table Text Block] | The following table sets forth revenues disaggregated by customer sales channel (in millions):
| Three Months Ended June 30, 2018 |  | Six Months Ended June 30, 2018
Revenues: |  |  |
Distributor | $ | 158.4 |  |  | $ | 276.7 |
Direct | 84.1 |  |  | 150.2 |
Total | $ | 242.5 |  |  | $ | 426.9 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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