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Product Sales
 3 Months Ended
Mar. 31, 2020
Revenues [Abstract]  
Product Sales Product Sales
Net product sales consist of the following:
 
 
Three Months Ended
March 31,
Net Product Sales in the United States
 
2020
 
2019
EYLEA®
 
$
1,172.0

 
$
1,074.1

Libtayo®
 
61.7

 
26.8

ARCALYST®
 
3.0

 
3.5

 
 
$
1,236.7

 
$
1,104.4


Effective April 1, 2020, the Company is solely responsible for the development and commercialization of Praluent® in the United States and will record net product sales of Praluent in the United States. See Note 3 for further details.
The Company had product sales to certain customers that accounted for more than 10% of total gross product revenue for the three months ended March 31, 2020 and 2019. Sales to each of these customers as a percentage of the Company's total gross product revenue are as follows:
 
 
Three Months Ended
March 31,
 
 
2020
 
2019
Besse Medical, a subsidiary of AmerisourceBergen Corporation
 
54
%
 
59
%
McKesson Corporation
 
36
%
 
31
%