ballengerb1 is correct on this, here is what your going to run into. The stain isn't t on the surface, if you've tried to clean it yet you'll notice nothing happens, the blue dye from the toilet is under the viynl, the flooring you have has a paper backing and it has absorbed the dye, replacement is the only option here , sorry
This is a wax ring problem you need to look into, your floor will start to rott next, this is the early stages of a bigger problem so really it's a good thing it turned blue so you'd see the leak, your landlord can thank you later
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