Share-Based Compensation Plans (Summary Of The Adjustments To Options Outstanding) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	2,311,000	2,024,200	1,978,400
Exercise Price	$ 30.05	$ 28.30	$ 24.02
2012 Special Cash Dividend [Member] | Granted 2006 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	262,418
Exercise Price	$ 22.55
2012 Special Cash Dividend [Member] | Granted 2006 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	305,992
Exercise Price	$ 19.34
2012 Special Cash Dividend [Member] | Granted 2007 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	83,452
Exercise Price	$ 30.62
2012 Special Cash Dividend [Member] | Granted 2007 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	97,306
Exercise Price	$ 26.26
2012 Special Cash Dividend [Member] | Granted 2008 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	171,792
Exercise Price	$ 21.85
2012 Special Cash Dividend [Member] | Granted 2008 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	200,318
Exercise Price	$ 18.74
2012 Special Cash Dividend [Member] | Granted 2009 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	100,209
Exercise Price	$ 10.34
2012 Special Cash Dividend [Member] | Granted 2009 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	116,851
Exercise Price	$ 8.87
2012 Special Cash Dividend [Member] | Granted 2010 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	608,278
2012 Special Cash Dividend [Member] | Granted 2010 [Member] | Pre-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 26.21
2012 Special Cash Dividend [Member] | Granted 2010 [Member] | Pre-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 29.23
2012 Special Cash Dividend [Member] | Granted 2010 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	709,309
2012 Special Cash Dividend [Member] | Granted 2010 [Member] | Post-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 22.48
2012 Special Cash Dividend [Member] | Granted 2010 [Member] | Post-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 25.07
2012 Special Cash Dividend [Member] | Granted 2011 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	434,674
2012 Special Cash Dividend [Member] | Granted 2011 [Member] | Pre-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 38.65
2012 Special Cash Dividend [Member] | Granted 2011 [Member] | Pre-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 47.47
2012 Special Cash Dividend [Member] | Granted 2011 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	506,873
2012 Special Cash Dividend [Member] | Granted 2011 [Member] | Post-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 33.15
2012 Special Cash Dividend [Member] | Granted 2011 [Member] | Post-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 40.71
2012 Special Cash Dividend [Member] | Granted 2012 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	403,750
Exercise Price	$ 50.38
2012 Special Cash Dividend [Member] | Granted 2012 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	470,805
Exercise Price	$ 43.21
2010 Special Cash Dividend [Member] | Granted 2006 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	707,535
Exercise Price	$ 29.37
2010 Special Cash Dividend [Member] | Granted 2006 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	921,281
Exercise Price	$ 22.55
2010 Special Cash Dividend [Member] | Granted 2007 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	64,100
Exercise Price	$ 39.88
2010 Special Cash Dividend [Member] | Granted 2007 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	83,452
Exercise Price	$ 30.62
2010 Special Cash Dividend [Member] | Granted 2008 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	151,904
2010 Special Cash Dividend [Member] | Granted 2008 [Member] | Pre-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 28.45
2010 Special Cash Dividend [Member] | Granted 2008 [Member] | Pre-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 36.74
2010 Special Cash Dividend [Member] | Granted 2008 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	197,834
2010 Special Cash Dividend [Member] | Granted 2008 [Member] | Post-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 21.85
2010 Special Cash Dividend [Member] | Granted 2008 [Member] | Post-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 28.21
2010 Special Cash Dividend [Member] | Granted 2009 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	107,779
Exercise Price	$ 13.46
2010 Special Cash Dividend [Member] | Granted 2009 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	140,371
Exercise Price	$ 10.34
2010 Special Cash Dividend [Member] | Granted 2010 [Member] | Pre-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	502,682
2010 Special Cash Dividend [Member] | Granted 2010 [Member] | Pre-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 34.13
2010 Special Cash Dividend [Member] | Granted 2010 [Member] | Pre-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 38.06
2010 Special Cash Dividend [Member] | Granted 2010 [Member] | Post-Dividend Grant Terms [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Number of Shares	654,673
2010 Special Cash Dividend [Member] | Granted 2010 [Member] | Post-Dividend Grant Terms [Member] | Minimum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 26.21
2010 Special Cash Dividend [Member] | Granted 2010 [Member] | Post-Dividend Grant Terms [Member] | Maximum [Member]
Special Cash Dividend And Stock Option Adjustments [Line Items]
Exercise Price	$ 29.23