Aon reported a rise in net income to $298m (£186m) in the first half of the year, up from $160m (£99.7m) the year before.
Revenues were up by 15% to $4.8bn (£2.99bn), with growth in insurance broking compensating for shrinking sales from the group's underwriting divisions.
Risk and insurance brokerage from Aon's international operations, which include the UK, increased by 10% to $1.03bn (£642m) at 30 June from $833m (£519m) the year before.
Total organic revenue growth for the segment was 11%, with pre-tax income up by 22% to $175m (£1.09m) from $144m (£90m).
Insurance underwriting revenue in the second quarter fell to $692m (£431m) from $750m (£467m) at the same point the year before, mainly as a result of cutbacks in accident, health and life.