Left panel: Fraction of stellar mass within R_200c that is not bound to satellites but instead in the BCG or ICL, f_{ICL + BCG}, against the halo mass M_200c, for the Magneticum (blue), IllustrisTNG (purple), Horizon-AGN (gold) and Hydrangea (orange) clusters. Right panel: Same as the left panel but for the Magneticum galaxy clusters only, colored by the cluster formation redshift z_form. Colors as indicated in the legend.