Table:
|  | Year Ended December 31, |  |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| U.S. | $1,979.6 | $1,723.9 | 1,504.5 |
| International | 1,008.5 | 936.2 | 727.4 |
|  | $2,988.1 | $2,660.1 | $2,231.9 |
Paragraphs:
18. Geographic Information
Revenue by geography is based on the customer's billing address, and was as follows:
No individual international country represented more than 10% of total revenue in any period presented.
Question:
How do they determine the geographic location of revenue earned?
Answer: based on the customer's billing address