Detached and unattached imply that one is disconnected, not a part of, disengaged or uncommitted.
Enlightenment comes through a process of paying attention, deep commitment and insight into our interconnectedness.
Non attachment is not clinging to the passage of emotions (or whatever) as it arises and then falls away.
So some one who was detached or unattached might be unmoved by a beautiful sunset. But some one practicing non attachment would be rightly moved by it, and let it pass to be moved by the night, the dawn and the day.
Each moment is fully a marvel in and of its own and so there isn’t room to attach to its passing or one isn’t still paying attention to this moment.