U.S. Stocks Decline Amid Mixed Earnings, Valeant's Volatile Ride

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  • Biotech shares slide as Valeant Pharmaceuticals plunges
  • General Motors rallies, Chipotle slumps after results

U.S. stocks declined after Valeant Pharmaceuticals International Inc. took health-care stocks on a wild ride, distracting investors from one of the busiest days for corporate earnings so far this season.

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