Conversation so far:
what is known of nicole's wealth?
In 2002, Kidman first appeared on the Australian rich list published annually in the Business Review Weekly.
what is learnt from this article?
In the 2011 published list, Kidman's wealth was estimated at A$304 million.

Question: what more is known about her wealth?
Self-contained rewrite: what more is known about Nocole Kidman's wealth besides the fact that in the 2011 published list Kidman's wealth was estimated at a $304 million?