Florida has no specific law of its own concerning overtime and double time wages. A visit to the Florida state website leads you the Federal Department of Labor website's section on overtime wage laws, set forth in the FLSA.
Federal law concerning payment of overtime and double time wages enforces the Fair Labor Standards Act (FLSA), which issues the standards on minimum wage and overtime pay rates. The FLSA states, "Overtime pay at a rate of not less than 1 1/2 times their regular rate of pay is required after 40 hours of work in a work week." The FLSA does not mandate any difference in overtime rates for holidays or weekends. So under the FLSA, your employer is only required to pay you time and a half. If your contract states that they will pay double time, they are then bound to pay you at that double rate.