Description of Business and Summary of Significant Accounting Policies (Foreign Currency Translation) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Description of Business and Summary of Significant Accounting Policies | |||
| Foreign exchange losses, net of the foreign currency derivatives | $ 1.6 | $ 0.1 | $ 0.6 |