Float overflowing out of a block with 'overflow: visible'

blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah. blah blah blah blah.

The block above has 'overflow: visible' and has a float overflowing into it. How does its text interact with the float?