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Share-Based Compensation And Benefit Plans (Summary Of Share Incentive Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Share-Based Compensation And Benefit Plans [Abstract]
Outstanding Options, Balance Beginning	1,847,136		1,983,358	1,536,527
Weighted Average Exercise/Grant Price, balance beginning	$ 42.37		$ 41.39	$ 44.96
Granted, Options Outstanding			55,895	489,509
Granted, Weighted Average Exercise/Grant Price			$ 43.94	$ 30.06
Exercised/Vested, Options Outstanding	(504,838)		(141,213)	(18,521)
Exercised/Vested, Weighted Average Exercise/Grant Price	$ 42.59		$ 32.54	$ 33.45
Forfeited, Options Outstanding	(2,762)		(50,904)	(24,157)
Forfeited, Weighted Average Exercise/Grant Price	$ 48.02		$ 46.65	$ 45.08
Net activity, Options Outstanding	(507,600)		(136,222)	446,831
Outstanding Options, Balance Ending	1,339,536	[1]	1,847,136	1,983,358
Weighted Average Exercise/Grant Price, balance ending	$ 42.27		$ 42.37	$ 41.39
Nonvested share awards outstanding beginning, Share Awards Outstanding	741,505		595,153	520,285
Nonvested share awards outstanding beginning, Weighted Average Exercise/Grant Price	$ 42.16		$ 46.20	$ 59.40
Granted, Share Awards Outstanding	347,084		372,661	329,018
Granted, Weighted Average Exercise/Grant Price	$ 57.00		$ 40.05	$ 30.11
Exercised/Vested, Share Awards Outstanding	(243,874)		(214,923)	(188,892)
Exercised/Vested, Weighted Average Exercise/Grant Price	$ 47.19		$ 49.17	$ 53.76
Forfeited, Share Awards Outstanding	(25,961)		(11,386)	(65,258)
Forfeited, Weighted Average Exercise/Grant Price	$ 44.51		$ 39.64	$ 51.06
Net activity, Nonvested Share Awards Outstanding	77,249		146,352	74,868
Nonvested share awards outstanding ending, Share Awards Outstanding	818,754		741,505	595,153
Nonvested share awards outstanding ending, Weighted Average Exercise/Grant Price	$ 46.88		$ 42.16	$ 46.20
[1] The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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