[Solved]-Decimal values for yAxis categories in Highcharts-Highcharts

You could always use plot bands to display categories on the Y axis. That way you could still keep the actual values. I have demonstrated that with your code here.

EDIT

Here is another example with the grid lines taken off and the plotBands each with their own color. Here is the color chart if you wan to change any of them.

If you prefer to use the plot bands and no y-axis labels, here is an example of that. I think it works just fine. If the user really wants to see the exact value they can hover over the point.