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Product Sales
 3 Months Ended
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]  
Product Sales Product Sales
Net product sales consist of the following:
Three Months Ended
March 31,
(In millions)20252024
EYLEA HD®
U.S.$306.8 $200.0 
EYLEA®
U.S.736.0 1,201.6 
Total EYLEA HD and EYLEAU.S.1,042.8 1,401.6 
Libtayo®
U.S.192.5 159.2 
Libtayo
Rest of world
92.6 104.7 
Total Libtayo
Global
285.1 263.9 
Praluent®
U.S.56.8 70.0 
Evkeeza®
U.S.30.9 24.8 
Inmazeb®
Rest of world
— 1.0 
$1,415.6 $1,761.3 
As of March 31, 2025 and December 31, 2024, the Company had $3.760 billion and $4.278 billion, respectively, of trade accounts receivable that were recorded within Accounts receivable, net.
The Company had product sales to certain customers that each accounted for more than 10% of total gross product revenue for the three months ended March 31, 2025 and 2024. 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,
20252024
Customer A
51 %51 %
Customer B
25 %24 %