For the October-December quarter, net income attributable to shareholders from continuing operations rose to $277 million, or 82 cents a share, from $232 million, or 67 cents a share, a year ago.
Excluding items, earnings from continuing operations were 97 cents a share.
Total revenue rose 3 pct to $3 billion.
Revenue from its human resources solutions unit rose 3 percent to $1.2 billion.
Analysts, on average, had expected a profit of 96 cents a share on revenue of $3 billion, according to Thomson Reuters I/B/E/S.
Aon shares closed at $49.37 on Thursday on the New York Stock Exchange.
(Reporting by Aman Shah in Bangalore; Editing by Sriraj Kalluvila)