How to write a function date function that doesn't activate when there are blanks

I am trying to write a function that has 3 different column dates that could be due and if any of them are due a string, "Renew" will be returned in a 4th column. It works great when all of the date fields are filled out, but also outputs "Renew" when any of the date columns are blank. How can I adjust this function so one or more of the date columns can be blank and not active the function?

=IF(OR(TODAY() > [IDF Task Date End]@row, TODAY() > [Escort Task End Date]@row, TODAY() > [Task End Date]@row), "Renew")


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