It's happened twice before. Both times at home, both times against Iowa, both times by 20 points. 1/22/55, a 93-73 win. And 2/23/85, a 78-58 win.
There were a few 18 pointers, most notably of course against that Magic Johnson guy.
So this is our largest margin of victory away from home against a ranked opponent. Polls started in 1949, so they missed our National championship season of 1931. (Yes, we still should recognize that!!!)
Now ... 19-point LOSSES against nationally ranked teams .... well there's been a few.