Share-Based Payment Arrangements (Summary Of Stock Options Outstanding And Exercisable) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	2,326,776
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5.9
Options Outstanding, Weighted Average Exercise Price per Share	$ 40.11
Options Exercisable	1,110,743
Options Exercisable, Weighted Average Contractual Life (Years)	4.7
Options Exercisable, Weighted Average Exercise Price	$ 39.74
$14.62 - $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	25,100
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	1.0
Options Outstanding, Weighted Average Exercise Price per Share	$ 14.62
Options Exercisable	25,100
Options Exercisable, Weighted Average Contractual Life (Years)	1.0
Options Exercisable, Weighted Average Exercise Price	$ 14.62
Minimum Exercise Price	$ 14.62
Maximum Exercise Price	$ 15.00
$15.01 - $25.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	49,763
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	2.1
Options Outstanding, Weighted Average Exercise Price per Share	$ 19.64
Options Exercisable	49,763
Options Exercisable, Weighted Average Contractual Life (Years)	2.1
Options Exercisable, Weighted Average Exercise Price	$ 19.64
Minimum Exercise Price	$ 15.01
Maximum Exercise Price	$ 25.00
$25.01 - $35.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	109,801
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3.2
Options Outstanding, Weighted Average Exercise Price per Share	$ 32.60
Options Exercisable	109,801
Options Exercisable, Weighted Average Contractual Life (Years)	3.2
Options Exercisable, Weighted Average Exercise Price	$ 32.60
Minimum Exercise Price	$ 25.01
Maximum Exercise Price	$ 35.00
$35.01 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	639,750
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6.8
Options Outstanding, Weighted Average Exercise Price per Share	$ 37.92
Options Exercisable	160,383
Options Exercisable, Weighted Average Contractual Life (Years)	5.7
Options Exercisable, Weighted Average Exercise Price	$ 37.40
Minimum Exercise Price	$ 35.01
Maximum Exercise Price	$ 40.00
$40.01 - $44.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	1,282,118
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6.1
Options Outstanding, Weighted Average Exercise Price per Share	$ 42.19
Options Exercisable	593,952
Options Exercisable, Weighted Average Contractual Life (Years)	4.9
Options Exercisable, Weighted Average Exercise Price	$ 42.81
Minimum Exercise Price	$ 40.01
Maximum Exercise Price	$ 44.00
$44.01 - $48.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	220,244
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5.4
Options Outstanding, Weighted Average Exercise Price per Share	$ 45.62
Options Exercisable	171,744
Options Exercisable, Weighted Average Contractual Life (Years)	5.3
Options Exercisable, Weighted Average Exercise Price	$ 45.35
Minimum Exercise Price	$ 44.01
Maximum Exercise Price	$ 48.15