If you want an html break you could add or replace with <br>
<cfset lineFeed = "<br />"&chr(13)&chr(10)>
ok and if you wanted it every 20 characters change to a mod function and use i
<cfscript>
for (i=1; i lte len(myString); i=i+1)
{
if (i mod lineBreakPos eq 0)
{
myString = Insert(lineFeed, myString, i);
}
}
</cfscript>