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Business Segment and Geographic Information (Tables)
3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Revenue from External Customers by Geographic Areas
The following table sets forth revenues by our two primary geographical markets, United States and outside of the United States, based on the geographic location to which we deliver the product:
 
Three Months Ended 
 March 31, 2019
 
Three Months Ended 
 March 31, 2018
(In millions)
Amount
 
% of Total
 
Amount
 
% of Total
Revenues:
 
 
 
 
 
 
 
United States
$
210.5

 
75
%
 
$
145.4

 
79
%
Outside of the United States
70.0

 
25
%
 
39.0

 
21
%
Total
$
280.5

 
100
%
 
$
184.4

 
100
%
Disaggregation of Revenue
The following table sets forth revenues disaggregated by customer sales channel:
 
Three Months Ended 
 March 31, 2019
 
Three Months Ended 
 March 31, 2018
(In millions)
Amount
 
% of Total
 
Amount
 
% of Total
Revenues:
 
 
 
 
 
 
 
Distributor
$
187.8

 
67
%
 
$
118.3

 
64
%
Direct
92.7

 
33
%
 
66.1

 
36
%
Total
$
280.5

 
100
%
 
$
184.4

 
100
%