Bill Gross, the one-time bond king who built investing giant Pimco from the ground up 48 years ago then went on to run his own fund at Janus Henderson, announced his retirement Monday. The retirement, effective March 1, marks the end of an era, closing a career for a fixed income expert who once had the ear of policymakers in the highest places. After leaving Pimco, Gross was never able to regain the standing he once held, and the fund he ran for Janus Henderson had badly underperformed for most of the nearly five years he had been there. "I've...