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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