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Business Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Schedule of Revenue from External Customers by Geographic Areas | The table below 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. The majority of our long-lived assets are located in the United States.
| Twelve Months Ended December 31,
| 2020 |  | 2019 |  | 2018
(Dollars in millions) | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
United States | $ | 1,509.5 |  |  | 78 | % |  | $ | 1,161.5 |  |  | 79 | % |  | $ | 818.4 |  |  | 79 | %
Outside of the United States | 417.2 |  |  | 22 | % |  | 314.5 |  |  | 21 | % |  | 213.2 |  |  | 21 | %
Total | $ | 1,926.7 |  |  | 100 | % |  | $ | 1,476.0 |  |  | 100 | % |  | $ | 1,031.6 |  |  | 100 | %
Schedule of Disaggregation of Revenue | The following table sets forth revenues by major sales channel for the twelve months ended December 31, 2020, 2019 and 2018:
| Twelve Months Ended December 31,
| 2020 |  | 2019 |  | 2018
(Dollars in millions) | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Distributor | $ | 1,437.6 |  |  | 75 | % |  | $ | 1,011.6 |  |  | 69 | % |  | $ | 652.9 |  |  | 63 | %
Direct | 489.1 |  |  | 25 | % |  | 464.4 |  |  | 31 | % |  | 378.7 |  |  | 37 | %
Total | $ | 1,926.7 |  |  | 100 | % |  | $ | 1,476.0 |  |  | 100 | % |  | $ | 1,031.6 |  |  | 100 | %

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&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://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=120311839&loc=d3e9038-108599 + Details
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