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Share-Based Compensation and Benefit Plans (Stock Option) (Narrative) (Details) - Stock option [Member] - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-Based Compensation and Benefit Plans    
Weighted-average grant date fair value of options awarded $ 106.13 $ 105.47
Remaining unrecognized compensation expense $ 35.8  
Weighted-average period for cost recognition 2 years 7 months 6 days  
Employee stock option [Member]    
Share-Based Compensation and Benefit Plans    
Options expiration period 10 years  
Vesting period 4 years  
Option vesting rate per year 25.00%