First of all, don't order a death certificate through Ancestry. You can get one directly from Florida for about 1/4 the price. You don't need a Social Security number to get a death certificate from Florida.
Cost is $5. Because it is more than 50 years old, you will get cause of death.
Here is the link.http://www.doh.state.fl.us/planning_eval/vital_statistics/DH...
I usually just send them a short letter, with name, date, place and include a check for $5. I get the certificate in a few weeks.