I did the same, but, the floor is ceramic tile. I use guitar strings to cut
the seal when it's time to remove the toilet.
Determine a suitable length. Trim the string to that length. Twist a loop
into each end and put a stick in each loop to make handles. Use the newly
constructed device as you would use a saw. Cut through the silicone to
release the toilet.
Works for me.
(This is much the same method you would use to cut the sealer around a
windshield. There are tools like this sold, but, guitar strings only cost
about $5 a set.)
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