Share-Based Compensation Plans (Company's Shareholder Approved And Non-Approved Plans) (Details) (USD $) In Thousands, except Share data, unless otherwise specified			12 Months Ended
	May 18, 2011	Feb. 24, 2011	Dec. 31, 2011 Compensation Plans Approved By Shareholders [Member] years	Dec. 31, 2010 Compensation Plans Approved By Shareholders [Member] years	Dec. 31, 2009 Compensation Plans Approved By Shareholders [Member] years	Dec. 31, 2011 Compensation Plans Not Approved By Shareholders [Member] years	Dec. 31, 2010 Compensation Plans Not Approved By Shareholders [Member] years	Dec. 31, 2009 Compensation Plans Not Approved By Shareholders [Member] years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, Shares			2,657,796	2,418,756	1,967,626	20,000	37,500	83,000
Outstanding at January 1, Weighted- Average Exercise Price/Share			$ 81.16	$ 79.86	$ 80.29	$ 48.01	$ 43.48	$ 37.09
Granted - Shares			345,600	384,890	654,900
Granted - Weighted- Average Exercise Price/Share	$ 90.49	$ 86.62	$ 86.68	$ 84.63	$ 72.01
Exercised - Shares			477,320	78,730	138,170	20,000	17,500	45,500
Exercised - Weighted- Average Exercise Price/Share			$ 66.12	$ 52.35	$ 43.55	$ 48.01	$ 38.30	$ 31.83
Forfeited/Cancelled/Expired - Shares			209,800	67,120	65,600
Forfeited/Cancelled/Expired - Weighted- Average Exercise Price/Share			$ 88.91	$ 87.75	$ 91.06
Outstanding at December 31, Shares			2,316,276	2,657,796	2,418,756		20,000	37,500
Outstanding at December 31, Weighted- Average Exercise Price/Share			$ 84.39	$ 81.16	$ 79.86		$ 48.01	$ 43.48
Outstanding - Weighted- Average Remaining Contractual Term			6.0	5.8	6.2	0.0	0.7	1.4
Outstanding - Aggregate Intrinsic Value			$ 12,121	$ 22,309	$ 26,186		$ 742	$ 1,592
Exercisable at December 31, Shares			1,229,481	1,479,176	1,251,276		20,000	37,500
Exercisable - Weighted- Average Exercise Price/Share			$ 84.94	$ 79.33	$ 75.78		$ 48.01	$ 43.48
Exercisable - Weighted-Average Remaining Contractual Term			4.4	3.9	4.2	0.0	0.7	1.4
Exercisable - Aggregate Intrinsic Value			$ 7,920	$ 15,773	$ 17,304		$ 742	$ 1,592