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Computation of Earnings Per Common Share - Narratives (Details) - $ / shares
Jul. 28, 2018
Apr. 28, 2018
Sep. 15, 2015
Convertible Note Hedge      
Shares used in computing earnings per common share:      
Debt instrument, convertible, conversion price (per share) $ 96.89   $ 96.89
0.75% Convertible Senior Notes Due 2021      
Shares used in computing earnings per common share:      
Debt, interest rate (in percent) 0.75%    
Debt instrument, convertible, conversion price (per share)     96.89
Class of warrant or right, exercise price of warrants or rights (per warrant) $ 130.43   $ 130.43
Weighted Average | 0.75% Convertible Senior Notes Due 2021      
Shares used in computing earnings per common share:      
Share price (usd per share) $ 99.27 $ 110.46