The net cash flow for a firm in January, February, and March is $$$$4\mathrm{.}3$ million, $$$$4\mathrm{.}8$ million, and $$4\mathrm{.}2$ million, respectively. What is the cumulative net cash flow for March?

Note: Negative amount should be indicated by a minus sign. Enter your answer in millions of dollars rounded to $1$ decimal place.