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Business Segment and Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Schedule of 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,
 
2019
 
2018
 
2017
(Dollars in millions)
Amount
 
%
of Total
 
Amount
 
%
of Total
 
Amount
 
%
of Total
Revenues:
 
 
 
 
 
 
 
 
 
 
 
United States
$
1,161.5

 
79
%
 
$
818.4

 
79
%
 
$
596.2

 
83
%
Outside of the United States
314.5

 
21
%
 
213.2

 
21
%
 
122.3

 
17
%
Total
$
1,476.0

 
100
%
 
$
1,031.6

 
100
%
 
$
718.5

 
100
%
Schedule of Disaggregation of Revenue
The following table sets forth revenues by major sales channel for the twelve months ended December 31, 2019, 2018 and 2017:
 
Twelve Months Ended December 31,
 
2019
 
2018
 
2017
(Dollars in millions)
Amount
 
%
of Total
 
Amount
 
%
of Total
 
Amount
 
%
of Total
Revenues:
 
 
 
 
 
 
 
 
 
 
 
Distributor
$
1,011.6

 
69
%
 
$
652.9

 
63
%
 
$
538.0

 
75
%
Direct
464.4

 
31
%
 
378.7

 
37
%
 
180.5

 
25
%
Total
$
1,476.0

 
100
%
 
$
1,031.6

 
100
%
 
$
718.5

 
100
%