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Computation of Earnings Per Share - Common Share Equivalents Not Included in the Computation of Diluted EPS (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Anti-dilutive common stock equivalents (in shares) 0.2 0.0 0.3
Average market price per share of Common Stock during the year (in dollars per share) $ 148.38 $ 135.60 $ 116.09