seems this state law change conflicts with the national government's commitment to an international convention on road traffic dating to 1949. Since national law takes precedence in this case, the requirement for the IDA has (for now) been recognised as being unenforceable, and the Department of Highway Safety and Motor Vehicles is recommending that the local law enforcement agencies do not enact enforcement action based solely on the lack of an International Driving Permit. That said, car rental agencies in Florida have already amended their rules to require IDA before rental commences. This is still applicable even if the car was booked up months in advance.
Best thing to do therrefore is contact your tour operator or rental agency for the lastest situation.