Ball Corporation announced an agreement to repurchase approximately $250 million of its outstanding common stock in a privately negotiated, accelerated stock repurchase transaction with Citibank N.A., using cash on hand and available borrowings.   Subject to certain conditions, the transaction will commence today and reduce Ball’s outstanding common stock by a total of approximately 4 million shares. Following the completion of today’s transaction, 45 million shares remain available for repurcha...