Share-Based Compensation (Schedule Of Weighted Average Remaining Life Of Options Outstanding Within Stated Exercise Prices) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Options Outstanding, Number of Options	1,097,620
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 50.14
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	4.3
Exercise Price Range Per Share, Options Exercisable, Number of Options	789,952
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 47.64
Exercise Price Range Per Share From $22.88 To $29.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Minimum	$ 22.88
Exercise Price Range Per Share, Maximum	$ 29.90
Exercise Price Range Per Share, Options Outstanding, Number of Options	21,745
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 24.87
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	0.1
Exercise Price Range Per Share, Options Exercisable, Number of Options	21,745
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 24.87
Exercise Price Range Per Share From $29.91 To $39.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Minimum	$ 29.91
Exercise Price Range Per Share, Maximum	$ 39.85
Exercise Price Range Per Share, Options Outstanding, Number of Options	144,007
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 32.05
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	1.2
Exercise Price Range Per Share, Options Exercisable, Number of Options	144,007
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 32.05
Exercise Price Range Per Share From $39.86 To $49.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Minimum	$ 39.86
Exercise Price Range Per Share, Maximum	$ 49.79
Exercise Price Range Per Share, Options Outstanding, Number of Options	388,459
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 46.47
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	3.1
Exercise Price Range Per Share, Options Exercisable, Number of Options	366,059
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 46.49
Exercise Price Range Per Share From $49.80 To $51.11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Minimum	$ 49.80
Exercise Price Range Per Share, Maximum	$ 51.11
Exercise Price Range Per Share, Options Outstanding, Number of Options	10,500
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 50.51
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	5.6
Exercise Price Range Per Share, Options Exercisable, Number of Options	6,143
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 50.65
Exercise Price Range Per Share From $51.12 To $54.91 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Minimum	$ 51.12
Exercise Price Range Per Share, Maximum	$ 54.91
Exercise Price Range Per Share, Options Outstanding, Number of Options	101,128
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 54.29
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	6.5
Exercise Price Range Per Share, Options Exercisable, Number of Options	52,065
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 54.22
Exercise Price Range Per Share From $54.92 To $111.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range Per Share, Minimum	$ 54.92
Exercise Price Range Per Share, Maximum	$ 111.71
Exercise Price Range Per Share, Options Outstanding, Number of Options	431,781
Exercise Price Range Per Share, Options Outstanding, Weighted Average Exercise Price	$ 59.76
Exercise Price Range Per Share, Options Outstanding, Weighted Average Remaining Life	6.2
Exercise Price Range Per Share, Options Exercisable, Number of Options	199,933
Exercise Price Range Per Share, Options Exercisable, Weighted Average Exercise Price	$ 61.66