Nature of Business and Accounting Policies - Foreign Currency Gain (Loss) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Accounting Policies [Abstract] | |||
| Derivative term (less than) | 1 month | ||
| Foreign Currency Translation | |||
| Net foreign currency transaction loss | $ 5.2 | $ 1.1 | $ 5.5 |