I'm sure that anything with a skeletal mesh uses the skeletal mesh for the collision mesh (or some other method we don't have to worry about).
One thing to note, if your mesh is rather complex and there will be many in the scene, you can just make an approximate duplicate to lessen the impact on the game engine. For example, if you make a pillar with intricate cut designs modelled in 3d, you can just use a box of the same diameter and height for the collision mesh.