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Share-Based Compensation (Share-Based Compensation Principal Fair Value Assumptions) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 1.70% 1.80%    
Expected Volatility 22.50% 31.70%    
Expected dividend yield 1.70% 1.90%    
Forfeiture rate 5.00% 5.00% 5.00% 5.00%
Expected Life in years 5 years 7 months 6 days 5 years 4 months 24 days   5 years 4 months 24 days
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate     1.60% 1.70%
Expected Volatility     22.50% 31.70%
Expected dividend yield     1.40% 1.60%
Expected Life in years     5 years 7 months 6 days  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate     1.70% 1.80%
Expected Volatility     24.10% 39.60%
Expected dividend yield     1.70% 1.90%
Expected Life in years     6 years 1 month 6 days