*VALEANT, ACKMAN SAID TO TEAM UP FOR TAKEOVER OF ALLERGAN *VALEANT, ACKMAN SAID TO TEAM UP FOR TAKEOVER OF ALLERGAN*ACKMAN SAID TO HOLD STAKE OF NEARLY 10% IN ALLERGAN *VALEANT, ACKMAN SAID TO OFFER $15B CASH, REST STK FOR ALLERGAN *VALEANT-ACKMAN BID FOR ALLERGAN WOULD OFFER PREMIUM ABOUT 21%