Share-Based Compensation (Changes in Options Outstanding Under the Plans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Ten point seventy four dollars to sixty eight point seventy dollars [Member]
Weighted average remaining life, Outstanding, in years	6 years 8 months 4 days
Weighted average remaining life, Exercisable, in years	5 years 3 months 6 days
Stock Options [Member]
Shares subject to options, Beginning balance	6,354,882	6,846,895	6,836,029
Shares subject to options, Granted	1,541,025	1,518,335	1,958,476
Shares subject to options, Exercised	(1,515,955)	(1,789,615)	(1,854,058)
Shares subject to options, Cancelled	(94,601)	(220,733)	(93,552)
Shares subject to options, Ending balance	6,285,351	6,354,882	6,846,895
Shares subject to options, Exercisable	3,262,865
Weighted average exercise price, Beginning balance, in dollars per share	$ 56.49	$ 47.81	$ 43.46
Weighted average exercise price, Granted, in dollars per share	89.71	80.27	50.04
Weighted average exercise price, Exercised, in dollars per share	45.44	42.79	33.71
Weighted average exercise price, Cancelled, in dollars per share	79.53	61.91	56.22
Weighted average exercise price, Ending Balance, in dollars per share	66.95	$ 56.49	$ 47.81
Weighted average exercise price, Exercisable, in dollars per share	$ 55.76
Aggregate intrinsic value, Outstanding, in USD	$ 152.8
Aggregate intrinsic value, Exercisable, in USD	$ 115.7
Weighted average remaining life, Exercisable, in years	5 years 3 months 6 days