If you thought Taylor Swift couldn't get bigger, Bill Ackman thinks otherwise. The billionaire "activist investor" is notorious for securing a major position in underperforming companies and gutting them in the name of growth. His firm, Pershing Square Capital Management (LSE:PSH), has offered a takeover bid of $64 million to secure a leading stake in Universal Music Group (NYSE:UMG). "UMG's stock price has languished due to a combination of issues that are unrelated to the performance of its music business ...