37 Fla. Stat. §627.6131(7)

(7) Payment of a claim is considered made on the date the payment was mailed or electronically transferred. An overdue payment of a claim bears simple interest of 12 percent per year. Interest on an overdue payment for a claim or for any portion of a claim begins to accrue when the claim should have been paid, denied, or contested. The interest is payable with the payment of the claim.