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Earnings Per Share (Antidilutive Securities Excluded From the Computation of Diluted Earnings Per Share) (Details) - $ / shares
shares in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings, Shares 2.1 5.1
Antidilutive stock options based on application of the treasury stock method    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings, Shares 2.1 2.3
Antidilutive securities excluded from computation of earnings, Exercise Price Per Share $ 97.46 $ 87.62
Antidilutive stock options due to net loss available to holders of Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings, Shares 0.0 0.9
Antidilutive shares based on application of the treasury stock method    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings, Shares 0.0 0.2
Antidilutive shares due to net loss available to holders of Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings, Shares 0.0 1.7