I photographed this on a trip through southcentral PA and central VA in 2015. It seems surprisingly pale to me looking at the photo now. I remember I found it crawling on the surface (so I don't think it's a recent moult?) but i wish I remembered more about it. It was small, maybe 1.25 inches or so?
Millipedes (and centipedes) don't necessarily turn white after molting; rather they show their regular colors but more vibrant or paler. Millipedes also try their best not to move for weeks before and after molts so it is unlikely you will find surface-molting or recently molted individuals wandering about@VolkswagenBug
This is a juvenile julid or a species that is commonly this pale. However, as it was over an inch in length is a bit confusing as only a few species of invasive or native julids rarely get that large. There are many species of julid that all look very similar so I'm afraid I can't give an exact ID.