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Earnings Per Common Share And Share Awards Share-Based Valuation Assumptions (Details)
3 Months Ended
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Volatility 27.20%
Interest rate 0.80%
Yield rate 1.00%
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected life in years 6 years 2 months 12 days
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected life in years 7 years