IOWA CITY — A Cedar Rapids contractor sparring over millions for work on the University of Iowa Stead Family Children’s Hospital said it on multiple occasions already provided construction documents it believes it contractually owes the UI — despite university assertions the UI never got them and won’t pay until it does.Records obtained Friday by The Gazette appear to show that Gilbane Building Company — a Chicago firm hired to manage construction of the 14-story Children’s Hospital — reviewed and signed off on 136 pages of documents labeled “as-builts” in September 2017 — seven months after the hospital first started treating young patients.