Float calculates the amount spent in the current time period, and compares it to the amount spent in the same time period in the prior month.
As an example, as of January 20, the MoM % change is based on spending between January 1-20 and spending between December 1-20.
As of the end of the month, the MoM % change is based on spending between January 1-31 and spending between December 1-31.