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Product Sales
 6 Months Ended
Jun. 30, 2019
Revenues [Abstract]  
Product Sales Product Sales
Net product sales consist of the following:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
Net Product Sales in the United States
 
2019
 
2018
 
2019
 
2018
EYLEA®
 
$
1,160.3

 
$
992.0

 
$
2,234.4

 
$
1,976.0

Libtayo®
 
40.8

 
—

 
67.6

 
—

ARCALYST®
 
4.2

 
4.4

 
7.7

 
8.3

 
 
$
1,205.3

 
$
996.4

 
$
2,309.7

 
$
1,984.3


The Company had product sales to certain customers that accounted for more than 10% of total gross product revenue for each of the three and six months ended June 30, 2019 and 2018. Sales to each of these customers as a percentage of the Company's total gross product revenue are as follows:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
Besse Medical, a subsidiary of AmerisourceBergen Corporation
 
56
%
 
56
%
 
57
%
 
55
%
McKesson Corporation
 
34
%
 
35
%
 
32
%
 
37
%

The following table summarizes the provisions, and credits/payments, for sales-related deductions during the six months ended June 30, 2019 and 2018.
 
Rebates, Chargebacks, and Discounts
 
Distribution-
Related
Fees
 
Other Sales-
Related
Deductions
 
Total
Balance as of December 31, 2018
$
41.1

 
$
42.0

 
$
8.3

 
$
91.4

Provisions
185.1

 
114.0

 
33.3

 
332.4

Credits/payments
(139.5
)
 
(87.9
)
 
(30.9
)
 
(258.3
)
Balance as of June 30, 2019
$
86.7

 
$
68.1

 
$
10.7

 
$
165.5

 
 
 
 
 
 
 
 
Balance as of December 31, 2017
$
29.9

 
$
34.1

 
$
21.3

 
$
85.3

Provisions
97.7

 
102.1

 
19.9

 
219.7

Credits/payments
(91.1
)
 
(98.5
)
 
(24.4
)
 
(214.0
)
Balance as of June 30, 2018
$
36.5

 
$
37.7

 
$
16.8

 
$
91.0