Detroit won the season series with the Twins so a tie goes to Detroit. Cle currently leads the season series 4-3, unless the Twins go 4-2 (or better) in the remaining 6 games, a tie goes to Cle.
Edit: Magic #26 for Cle and 24 for Det. If the Twins go 16-15, the Twins win the central if Cle goes 21-10 or worse and Detroit goes 24-8 or worse.