I agree. This has absolutely nothing to do with IDM.
It's ambient, beatless. Generally tranquil & peaceful music, with maybe some more entrancing parts. Good as background music and why not, for tripping too.
7+/10
Biosphere - Man With A Movie Camera (Substrata²)
If one likes Biosphere, he is gonna like it ... :]
It's ambient with very few classical elements here and there ...
Definitely check:
Hazard
Also some Biosphere albums fit your description, not all though. Maybe Substrata and Autour De La Lune and there's his field recordings album as Geir Jenssen :
Cho Oyu 8201m – Field Recordings From Tibet from his trip to Tibet...
It's nice & trippy and intense and powerful (sometimes gets just a bit tiresome though, hm, depends on the mood as well)
but I've got to say that Vectorselector is my favourite Ocelot album by far
Psymatix?