American Idol creator Simon Fuller sits at No. 6 on the list with a fortune of approximately $540 million.
More than half of Cowell's personal wealth comes from his work in television, including judging for American Idol and serving as the producer of The X Factor, Britain's Got Talent, and America's Got Talent -- all three of which he created.
The rest of Cowell's fortune comes from his work as music producer for such stars as Susan Boyle and Leona Lewis.
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