Now that Nelson Peltz has won a surprise bidding war for Janus Henderson Group Plc, the activist investor can start to revamp the $493 billion asset manager he has circled for years. Peltz is paying about $8 billion, or $52 per share, for Janus Henderson – more than twice where its stock was trading when his Trian Fund Management disclosed its position in late 2020. At age 83, Peltz – who over the...