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Business Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Revenue from External Customers by Geographic Areas | The following table sets forth revenues by our two primary geographical markets, the United States and outside of the United States, based on the geographic location to which we deliver the product:
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
(Dollars in millions) | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Revenues: |  |  |  |  |  |  |  |  |  |  |
United States | $ | 818.4 |  |  | 79 | % |  | $ | 596.2 |  |  | 83 | % |  | $ | 497.5 |  |  | 87 | %
Outside of the United States | 213.2 |  |  | 21 | % |  | 122.3 |  |  | 17 | % |  | 75.8 |  |  | 13 | %
Total | $ | 1,031.6 |  |  | 100 | % |  | $ | 718.5 |  |  | 100 | % |  | $ | 573.3 |  |  | 100 | %
Disaggregation of Revenue | The following table sets forth revenues by major sales channel for the twelve months ended December 31, 2018, 2017 and 2016:
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
(Dollars in millions) | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Revenues: |  |  |  |  |  |  |  |  |  |  |
Distributor | $ | 652.9 |  |  | 63 | % |  | $ | 538.0 |  |  | 75 | % |  | $ | 411.8 |  |  | 72 | %
Direct | 378.7 |  |  | 37 | % |  | 180.5 |  |  | 25 | % |  | 161.5 |  |  | 28 | %
Total | $ | 1,031.6 |  |  | 100 | % |  | $ | 718.5 |  |  | 100 | % |  | $ | 573.3 |  |  | 100 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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