Protein phosphatase that catalyzes the dephosphorylation of the C-terminal domain of RNA polymerase II. Plays a role in RNA processing and termination. Plays a role in pre-mRNA polyadenylation via its interaction with SYMPK. {ECO:0000269|PubMed:15659578, ECO:0000269|PubMed:20861839, ECO:0000269|PubMed:23070812}. This is the function of SSU72 (SSU72 homolog, RNA polymerase II CTD phosphatase, ENSG00000160075).