From the examples posted here I would guess that this is a millipede in the Order Julida, Family Parajulidae. These are completely new to me, however, so I'll just leave it in ID Request. It has been hanging out in my mom's shed for about a week or so. When I visit next, if it is still there I may have the opportunity to get better photos. It is a creature that seems to prefer dark spots, out of sight. Finding it again could be a challenge.