Here's two links:
Florida DHSMV Dealer Licenses
Why must out-of-state residents have Florida proof of insurance before obtaining a license plate or registration renewal?
Florida insurance is required to meet the requirements of Florida Statutes. Only insurance issued or countersigned by a Florida agent is electronically reported to the Department of Highway Safety and Motor Vehicles for verification purposes.
FAQ's from Allstate:
Out-of-State Car Insurance: Everything You Need to Know