The company reported earnings of $277 million, up from $48 million in the comparable quarter a year earlier. Earnings were $1.14 a share, up from 19 cents a share.
Adjusted earnings were $1.87 a share, up from $1.71 a share. Analysts polled by FactSet were expecting $1.87 a share.
Revenue rose 1.8% to $2.61 billion. Analysts were expecting $2.68 billion.
Operating expenses fell 15%. Aon had a $176 million decrease from a non-cash impairment charge, the company said. Legacy litigation costs and restructuring expenses also fell, Aon said.