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 |