Amlin has said full-year pretax profits rose 84% to £342.7m from £186.7m in 2005.
The results beat analysts' expectations of £300.13m according to a forecast supplied by the company.
Gross written premiums rose to £1.113bn while the combined ratio fell to 72% from 82%.
Amlin declared a basic total dividend of 12 pence, up from 2005's 10.2p, but also announced a special dividend of 8 pence and said it would continue to pursue an active capital management policy in future.
Chief executive Charles Phillips told reporters on a conference call that he would look to revisit any further returns to capital after the 2007 hurricane season.
Phillips added that 2007 could be a year of high profitability for the group.
"2007 has every prospect of being an excellent year," he said. "Although it would be hard to get a return on equity of 34% (as Amlin did in 2006) year in, year out, I very much hope we can produce a good return," he said.
However, the company admitted that trading in the airline and commercial insurance lines have "fallen to levels where it was becoming more difficult to achieve a satisfactory return for the risk".
Amlin Bermuda, its newly-formed Bermudan business reported $223m of gross written premiums in its first full year of operation.
