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Stock-Based Compensation (Schedule Of Assumptions To Value SOSAR Awards Granted) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Risk-free interest rate 2.40% 1.60% 1.00%
Expected life 3 years 10 months 24 days 3 years 8 months 12 days 3 years 6 months
Expected dividend yield 0.00% 0.00% 0.00%
Volatility 32.20% 29.90% 32.20%
Performance Shares [Member]      
Risk-free interest rate   1.50% 0.90%
Expected life   3 years 3 years
Expected dividend yield   0.00% 0.00%
Volatility   29.90% 31.40%
SOSARS [Member]      
Weighted-average grant date fair value $ 77.61 $ 105.97 $ 117.48