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Business Segment and Geographic Information (Tables)
 12 Months Ended
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,
202020192018
(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 States417.2 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,
202020192018
(Dollars in millions)Amount%
of Total		Amount%
of Total		Amount%
of Total
Distributor$1,437.6 75 %$1,011.6 69 %$652.9 63 %
Direct489.1 25 %464.4 31 %378.7 37 %
Total$1,926.7 100 %$1,476.0 100 %$1,031.6 100 %