Italian trio relegated to Serie B
Juventus were also stripped of their last two Serie A titles and had 30 points deducted, meaning they are likely to stay down for two seasons.
AC Milan will stay in Serie A but will start the season docked 15 points.
All are barred from competing in Europe - Juventus, Milan and Fiorentina the Champions League; Lazio the Uefa Cup.
Lazio were penalised seven league points while Fiorentina suffered a 12-point penalty.