Read thoroughly. There is a "No reinstatement" clause, I called HR about it and it means exactly that. If you sign it, it means you can't be rehired by Molina after Oct 1st, indefinitely. If you continue reading it, it even goes into if you end up working at a company Molina acquired or merged with, you will be bounded to quit.
I'm not sure if everyone got the same document, but READ carefully. If you see anything questionable, ask a lawyer and negotiate if you need to.