Void is a late-game unique resource gained from temporal paradoxes, which in turn are generated by Chronospheres.
Void is an exotic resource and will grant you +10% happiness.
It is impossible to have a non-integer amount of void. It is always produced in integer quantities, and when void is spent, the game rounds the amount of void you have to be an integer.
The average amount of void produced per season is 0.005*chronospheres*(1+void_hoovers)*(10+chronocontrols*(1+2*distortion))