If this article can convince you that turnover is costing a ton of money, then it’s time to figure out the reasons they are leaving in the first place.
Here’s a top 10 list that shows most of the reasons are well within your control. I wouldn’t spend too much time on those things you don’t control, for example, spouses who move the family or an employee who wins the lotto.
My favorite is right at the top of the list, relationship with boss. Maybe it’s time for this idea to be top-of-mind for all your managers.