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Investments (Details 5) - USD ($)
$ in Millions
1 Months Ended
Sep. 30, 2015
May. 31, 2014
Dec. 31, 2015
Privately-held corporations      
Cost Method Investments      
Cost Method Investments     $ 137.2
SGI Member      
Cost Method Investments      
Cost Method Investments     $ 100.0
Investment purchased during the period $ 50.0 $ 50.0