Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Schedule of Weighted Average Assumptions) (Details)

v3.20.4
Stock-Based Compensation (Schedule of Weighted Average Assumptions) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term, years 4 years 4 months 20 days 4 years 6 months 4 years 6 months
Expected stock price volatility 21.19% 27.14% 28.39%
Risk-free interest rate 1.14% 2.49% 2.47%
Expected dividend yield 1.13% 1.03% 1.15%
Weighted average grant date fair value $ 14.67 $ 22.51 $ 18.86
Vesting period 4 years