expected output to be float for X Amount and Y Amount in Tile Generator

Not as it is built, and if you could use a non-integer value, it would not tile beyond a single square. What are you trying to achieve, there may be another way.

Incidentally - if you want to see how a node such as Tile Generator is made you can highlight it and press Ctrl+E to open the reference. In this case you will need to repeat that and look at the FX-Map within tile generator and then the functions that drive the iteration nodes within that FX map.

Dave