Stock-Based Compensation (Additional Information Related To Stock Options Activity) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
Total intrinsic value of stock options exercised | $ 8.8 | $ 11.7 | $ 27.7 |
Cash received from stock options exercised | 4.8 | 2.6 | 4.9 |
Total fair value of stock options vested | $ 0.8 | $ 1.2 | $ 0.1 |