Enlist each element of anonymous Generic List

I received an object fi.. and it is a field of someone anonymous object.

I want to enlist each element of the object fi if it belongs to Generic class List

if(fi.FieldType.IsGenericType && fi.FieldType.GetGenericTypeDefinition() == typeof(List<>))
   {
      foreach (object element in (XXX) k.Value)
      {

      }
   }

Well with that particular object I know it is List, so I can cast (List).

My question is: what should I cast to, to do not care about what Type of the list element?

I tried List<>, List .. it says I have to set the element Type to get cast succeeded.

Help.. pls.