An insurance company formed in London that conducts business in Florida is classified as:

An insurance company formed in London that conducts business in Florida is classified as alien because it is incorporated in a foreign country—specifically, the United Kingdom—and operates within the jurisdiction of Florida. Each state in the U.S. categorizes insurance companies based on their place of incorporation.

A domestic insurance company would be one that is incorporated within the state of Florida itself. A foreign insurance company refers to one formed in another U.S. state, not a different country. The term 'international' is not typically used in this context and does not accurately describe the regulatory classifications for insurance companies in relation to their incorporation locations. Thus, alien is the most appropriate classification for a company incorporated outside the United States conducting business in Florida.