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Business Segment and Geographic Information (Tables)
3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers by Geographic Areas The following table sets forth revenues for the periods shown 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:
 
Three Months Ended March 31,
 
2020
 
2019
(Dollars in millions)
Amount
 
% of Total
 
Amount
 
% of Total
United States
$
292.3

 
72
%
 
$
210.5

 
75
%
Outside of the United States
112.8

 
28
%
 
70.0

 
25
%
Total
$
405.1

 
100
%
 
$
280.5

 
100
%

Schedule of Disaggregation of Revenue
The following table sets forth revenues by major sales channel for the periods shown:
 
Three Months Ended March 31,
 
2020
 
2019
(Dollars in millions)
Amount
 
% of Total
 
Amount
 
% of Total
Distributor
$
286.1

 
71
%
 
$
187.8

 
67
%
Direct
119.0

 
29
%
 
92.7

 
33
%
Total
$
405.1

 
100
%
 
$
280.5

 
100
%