To become a millionaire, most investors probably need to generate robust investment returns for years and even decades. To do that, you'll want to find high-quality businesses that are poised to grow their profit steadily over the long term. 

Let's look at three such companies.

CEO Warren Buffett has managed Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) for nearly six decades, delivering fortune-building gains for its shareholders. Yet Buffett's crowning achievement may be how he's built the company to thrive even after the legendary investor eventually steps down.

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Source Fool.com