I wouldn't say Punk or IDM originated in Britain.

Maybe it's contentious as to what the first punk band was, but i can think of a few i would consider punk that predate British bands.

IDM is a pretty loose genre, Americans and Europeans pretty much made music like that in conjunction. Although Detroit techno is probably the single biggest influence on European IDM.

Saying either genre is owned by Britain is misleading, and pretty much untrue.