You can own an idea only insofar as you keep it a secret. Once the idea is out there, it is equally owned by the minds it inhabits. Kinsella has a good argument against IP https://www.stephankinsella.com/publications/against-intellectual-property/ .

Thomas Jefferson on ideas as property: If NATURE has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea... No one possesses the less, because every other possess the whole of it. He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.

I guess I'll give you a real answer, even though it's pretty easy to find much better information by watching some IP law history videos on YouTube.

I don't think there's a delineation between ownership and property. The typical IP distinction is between patent, copyright and trademark.

IP laws were created to let inventors (and authors, artists, etc.) profit exclusively off of what they invent for a given window of time. In a capitalistic society, this is necessary to incentivize creation of new original intellectual works, because without it others can simply copy someone elses work with less effort and profit off of their efforts.

Various forms of IP have different lengths usually because they've been extended again and again through lobbying efforts of various IP owning corporations. The classification lengths no longer have any basis in reality, IMO, and now tend towards stifling innovation by patent hoarders instead of driving it.

You can't own an idea per se, but you can own the rights to copy, distribute, and sell the physical manifestation of that idea.