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Equity, Stock Option Activity (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock option activity        
Options outstanding at the beginning of the period (in shares) 33,222,364 32,266,391 31,136,475  
Options granted (in shares) 6,302,100 7,029,600 7,560,450  
Options exercised (in shares) (3,464,876) (5,773,287) (5,703,254)  
Options forfeited (in shares) (508,920) (300,340) (727,280)  
Options outstanding at the end of the period (in shares) 35,550,668 33,222,364 32,266,391 31,136,475
Vested and non-vested options expected to vest at the end of the period (in shares) 33,437,668      
Exercisable at the end of the period (in shares) 16,261,168      
Weighted Average Exercise Price        
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) $ 52.27 $ 44.14 $ 37.62  
Weighted average exercise price, options granted (in dollars per share) 87.95 72.98 57.72  
Weighted average exercise price, options exercised (in dollars per share) 37.81 31.87 25.80  
Weighted average exercise price, options forfeited (in dollars per share) 69.03 55.16 50.17  
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) 59.77 $ 52.27 $ 44.14 $ 37.62
Weighted average exercise price, vested and non-vested options expected to vest (in dollars per share) 59.06      
Weighted average exercise price, exercisable (in dollars per share) $ 46.22      
Weighted Average Remaining Contractual Term        
Weighted average remaining contractual term of options outstanding 6 years 9 months 22 days 7 years 18 days 7 years 11 days 6 years 11 months 1 day
Weighted average remaining contractual term of options vested options and non-vested expected to vest 6 years 8 months 23 days      
Weighted average remaining contractual term of options exercisable 5 years 3 months 18 days      
Aggregate Intrinsic Value        
Aggregate intrinsic value of options outstanding $ 798.6      
Aggregate intrinsic value of options, vested and non-vested options expected to vest 772.9      
Aggregate intrinsic value of options exercisable $ 566.0