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Share-Based Compensation - Assumptions Used to Determine Fair Value of Options Granted (Details) - Stock Options
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assumptions used to determine fair value of options granted      
Dividend yield 1.70% 0.80% 0.50%
Expected volatility [1] 29.40% 25.50% 28.00%
Risk-free interest rate [2] 1.50% 2.80% 2.10%
Expected life of options (in years) [3] 5 years 8 months 12 days 5 years 8 months 12 days 5 years 8 months 12 days
Forfeiture rate 0.00% 0.00% 0.00%
[1]
Expected volatility is based on historical and implied volatility.
[2]
Risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant.
[3]
Expected life of options (in years) is based on the Company’s historical and expected exercise behavior.