In Florida, "Dissolution" is just a fancy name for divorce.  Dissolution is the dissolving of the legal bonds of marriage, restoring you back to the status of "single".  In Florida, there are only 2 requirements: 1) that you and/or your spouse have been residents of the State of Florida for over 6 months from the filing of a Petition for Dissolution (the law suit itself) and 2) that your marriage is irretrievable broken.

As for requirement number 1, the "residency" requirement give the Court "subject matter jurisdiction".  If your spouse is living out of state and has never lived with you in Florida then Florida does not have "personal jurisdiction" over your spouse.  You could get "bifurcated" divorce, but the Court could not deal with the more substantive issues of the case - equitable distribution, alimony, child support, time-sharing, etc.

As for requirement number 2, Florida is a "no fault" state, meaning things like adultery, abandonment, cruelty, abuse, domestic violence, neglect are not necessary or required or relevant to get a divorce in Florida.  These issues may be relevant for other aspects of the case. Adultery can be a relevant factor in alimony.  Cruelty, abuse, domestic violence and abandonment are relevant to children's issues.  

Please see the section "Dissolution 101" at the side for more information.