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Investments in Affiliated Companies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dividends or Distributions Nonmarketable Equity Securities $ 1.1 $ 1.0 $ 0.9
Unrealized Gain (Loss) on Securities $ 0.0 $ 0.0 $ 0.0