I have been using Epifanes Woodfinish Gloss followed by their Extra UV Clear Varnish with great results, but I also keep those teak items covered (wheel, cockpit table, etc.).
More importantly, you say you want to use it on the exterior "floor"? If you mean your teak deck or cockpit floor I would do nothing to it!!!! Unless you like falling on your ass regularly.
Epifanes Woodfinish Gloss is a high quality varnish but not enough resistant for the flooring?
On my boat, the teak is present on floor inlay, seating area, transom and transom steps and rail!
I want the same finish on all exterior wood and if I can not use Varnish, I will use oil!