Share-Based Compensation (Information Concerning Currently Outstanding and Exercisable Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Number of options outstanding, in shares	7,502,613
Weighted average remaining life, Outstanding, in years	5 years 5 months 30 days
Weighted average exercise price, options outstanding, in dollars per share	$ 36.21
Number of options exercisable, in shares	5,127,891
Weighted average remaining life, Exercisable, in years	4 years 3 months 1 day
Weighted average exercise price, option exercisable, in dollars per share	$ 30.47
10.01 - 20.00 [Member]
Number of options outstanding, in shares	610,934
Weighted average remaining life, Outstanding, in years	2 years 7 months 30 days
Weighted average exercise price, options outstanding, in dollars per share	$ 15.03
Number of options exercisable, in shares	610,934
Weighted average remaining life, Exercisable, in years	2 years 7 months 30 days
Weighted average exercise price, option exercisable, in dollars per share	$ 15.03
20.01 - 30.00 [Member]
Number of options outstanding, in shares	1,303,401
Weighted average remaining life, Outstanding, in years	4 years 4 months 30 days
Weighted average exercise price, options outstanding, in dollars per share	$ 25.60
Number of options exercisable, in shares	1,302,062
Weighted average remaining life, Exercisable, in years	4 years 4 months 30 days
Weighted average exercise price, option exercisable, in dollars per share	$ 25.60
30.01 - 40.00 [Member]
Number of options outstanding, in shares	3,164,061
Weighted average remaining life, Outstanding, in years	4 years 6 months 30 days
Weighted average exercise price, options outstanding, in dollars per share	$ 33.98
Number of options exercisable, in shares	2,746,192
Weighted average remaining life, Exercisable, in years	4 years 2 months 1 day
Weighted average exercise price, option exercisable, in dollars per share	$ 34.22
40.01 - 50.00 [Member]
Number of options outstanding, in shares	1,306,079
Weighted average remaining life, Outstanding, in years	7 years 4 months 30 days
Weighted average exercise price, options outstanding, in dollars per share	$ 41.95
Number of options exercisable, in shares	460,016
Weighted average remaining life, Exercisable, in years	6 years 3 months 30 days
Weighted average exercise price, option exercisable, in dollars per share	$ 41.88
50.01 - 60.00 [Member]
Number of options outstanding, in shares	1,118,138
Weighted average remaining life, Outstanding, in years	9 years 1 month 1 day
Weighted average exercise price, options outstanding, in dollars per share	$ 59.79
Number of options exercisable, in shares	8,687
Weighted average remaining life, Exercisable, in years	3 years 5 months 30 days
Weighted average exercise price, option exercisable, in dollars per share	$ 59.83