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Product Sales
 3 Months Ended
Mar. 31, 2019
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
 
2019
 
2018
EYLEA®
 
$
1,074.1

 
$
984.0

Libtayo®
 
26.8

 
—

ARCALYST®
 
3.5

 
3.9

 
 
$
1,104.4

 
$
987.9


The Company had product sales to certain customers that accounted for more than 10% of total gross product revenue for each of the three months ended March 31, 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
March 31,
 
 
2019
 
2018
Besse Medical, a subsidiary of AmerisourceBergen Corporation
 
59
%
 
55
%
McKesson Corporation
 
31
%
 
40
%

The following table summarizes the provisions, and credits/payments, for these sales-related deductions during the three months ended March 31, 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
78.6

 
52.8

 
16.1

 
147.5

Credits/payments
(60.8
)
 
(47.9
)
 
(0.4
)
 
(109.1
)
Balance as of March 31, 2019
$
58.9

 
$
46.9

 
$
24.0

 
$
129.8

 
 
 
 
 
 
 
 
Balance as of December 31, 2017
$
29.9

 
$
34.1

 
$
21.3

 
$
85.3

Provisions
48.5

 
51.7

 
11.2

 
111.4

Credits/payments
(30.7
)
 
(42.0
)
 
(14.7
)
 
(87.4
)
Balance as of March 31, 2018
$
47.7

 
$
43.8

 
$
17.8

 
$
109.3