Sun Life Financial Inc. today reported a drop in its third-quarter profit due to a $51 million after-tax charge related to the sale of a Chilean investment.

The isurer said net income for the quarter was $430 million ($367.5 million), or 74¢ a share, compared with $439 million, or 73¢ a share, in the year-before quarter.

Net earnings were trimmed by a foreign-exchange related charge stemming from Sun Life’s sale of Administradora de Fondos de Pensiones Cuprum S.A. during the summer, as the Chilean peso had depreciated against the Canadian dollar since the unit was acquired in 1998.

Stripping out the charge, operating earnings were $481 million, or 82¢ a share.

Quarterly revenue rose to $5.5 billion from $5.4 billion in the year-earlier period.

Return on equity was 11.7%, compared with 11.9%.

Operating return on equity was 13.1%.