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Share-based Compensation And Incentive Plans (Summary Of Stock Options Assumption) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted stock options 1,067,308 600,000
Expected term (in years) 5 years 6 months 5 years 6 months
Weighted average grant-date fair value per share $ 4.91 $ 9.57
Expected volatility range, Start 33.92% 36.48%
Expected volatility range, End 39.65% 40.49%
Risk-free interest rate range, Start 1.46% 1.67%
Risk-free interest rate range, End 2.12% 2.21%
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield range 2.13% 1.52%
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield range 1.15% 1.08%