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Share-Based Compensation (Summary Of Share Incentive Plans) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, Number At December 31, 2011	1,339,536
Granted, Options Outstanding	0
Exercised/Vested, Options Outstanding	(458,881)
Forfeited, Options Outstanding	(31,943)
Net activity, Options Outstanding	(490,824)
Outstanding Options, Number At September 30, 2012	848,712	[1]
Weighted Average Exercise/Grant Price, balance at December 31, 2011	$ 42.27
Granted, Weighted Average Exercise/Grant Price	$ 0.00
Exercised/Vested, Weighted Average Exercise/Grant Price	$ 40.74
Forfeited, Weighted Average Exercise/Grant Price	$ 60.56
Weighted Average Exercise/Grant Price, balance at September 30, 2012	$ 42.41	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested share awards outstanding at December 31, 2011, Share Awards Outstanding	818,754
Granted, Share Awards Outstanding	345,180
Exercised/Vested, Share Awards Outstanding	(274,119)
Forfeited, Share Awards Outstanding	(13,338)
Net activity, Nonvested Share Awards Outstanding	57,723
Nonvested share awards outstanding at September 30, 2012, Share Awards Outstanding	876,477
Nonvested share awards outstanding at December 31, 2011, Weighted Average Exercise/Grant Price	$ 46.88
Granted, Weighted Average Exercise/Grant Price	$ 63.50
Exercised/Vested, Weighted Average Exercise/Grant Price	$ 48.71
Forfeited, Weighted Average Exercise/Grant Price	$ 51.52
Nonvested share awards outstanding at September 30, 2012, Weighted Average Exercise/Grant Price	$ 52.77
[1] The aggregate intrinsic value of outstanding and exercisable options at September 30, 2012 were $18.9 million and $10.6 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $64.49 per share on September 30, 2012 and the strike price of the underlying award.

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