Is Floating License Global?

It depends upon the license agreement the company have with the vendor. Licenses terms are negotiable, especially if you are a large multi-national company purchasing 1000's of licenses. I don't know specific about Altera, but many EDA vendors have different license agreements for the same product. Altera's business is selling devices, so they might be flexible if they can sell more devices by offering this service. On the other hand, a Quartus license is very cheap compared to most other EDA tools.