Valeant Pharmaceuticals International will pay $8.7 billion to acquire Bausch & Lomb, the eye care company. Under the terms of the deal, Valeant will pay $4.5 billion to the investor group that owns Bausch & Lomb, led by private equity firm Warburg Pincus. It will also spend about $4.2 billion to repay Bausch & Lomb’s debt.   The agreement continues the flurry of deal-making in the health care industry, as companies seek to buy the growth they are hard-pressed to generate on t...