Energy Transfer's (ET -0.88%) business prints cash. The midstream giant's diversified portfolio of pipelines, processing plants, storage terminals, and export facilities acts as a toll booth for the country's energy superhighway. It is paid fees as oil, natural gas, and other energy commodities flow through its midstream network. The master limited partnership (MLP) generated a whopping $8.4 billion in cash last year,$4.4 billion of which it distributed to investors. The company has been steadily increasin ...