It acquired over 12 million shares of Stelco at C$20.50 per share, a premium of 4.2 percent to its close on Friday.
The insurer bought the stake in Stelco from Bedrock Industries, a unit of Lindsay Goldberg LLC, which owned 60.1 percent in the company before the sale.
Bedrock still holds about 47 percent stake in Stelco.
(Reporting By Aparajita Saxena in Bengaluru; Editing by Shinjini Ganguli)