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Earnings Per Common Share And Share Awards Share Awards Share-Based Assumptions (Details)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 7 years 7 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 26.20% 28.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.00% 1.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1.00% 1.00%