I have had good success in Chrome, Firefox and IE with using:
word-break: break-word;
word-wrap: break-word;
In my problem case I was using:
display: table-cell;
and I ended up having to include
max-width: 440px;
to get wrapping in all browsers. In most cases the max-width was not necessary. Using
word-break: break-all;
does not work well in IE because although long words without spaces will be wrapped, short words also stop wrapping at spaces.