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Loxa flavicollis
I found this insect upside down on a rail and thought it was dead. I turned it over and it started moving. A species of shield bug, I presume.
In a garden
Green Stink Bugs in the US Canada and Mexico are called Chinavia hilaris http://bugguide.net/node/view/9066 It has a blunter nose.
There is also a Southern Green Stink Bug called Nezara viridula
http://bugguide.net/node/view/19047 It has a pointier snout but not the red horns as in your specimen.
Team Brinez 1, thanks for your suggestion but does that species occur in the US in Florida?