The marriage needs to be irretrievably broken. In other words one of the parties will testify that it cannot be put back together through marriage counseling or by any other way. Not many people ever contest whether the marriage is irretrievably broken. So you get a Florida divorce just by requesting one and your spouse can at most delay it.
In Florida to get a divorce only one of the parties must be a Florida resident for the six month period immediately preceeding the filing of the petition for divorce. (although there may be other residency related issues if you also want the Court to rule on property or other issues) All you need to prove to get a divorce in Florida is that the marriage is irretrievably broken. This is different than some states where for example you have to prove adultery or violence or some other grounds, or be separated for some period of time.