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Share-Based Compensation (Summary Of Share Incentive Plans) (Details) (USD $)
3 Months Ended
Mar. 31, 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 (180,650)
Forfeited, Options Outstanding (29,730)
Net activity, Options Outstanding (210,380)
Outstanding Options, Number At March 31, 2012 1,129,156 [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 $ 43.12
Forfeited, Weighted Average Exercise/Grant Price $ 62.32
Weighted Average Exercise/Grant Price, balance at March 31, 2012 $ 41.61 [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 321,148
Exercised/Vested, Share Awards Outstanding (260,328)
Forfeited, Share Awards Outstanding (4,726)
Net activity, Nonvested Share Awards Outstanding 56,094
Nonvested share awards outstanding at March 31, 2012, Share Awards Outstanding 874,848
Nonvested share awards outstanding at December 31, 2011, Weighted Average Exercise/Grant Price $ 46.88
Granted, Weighted Average Exercise/Grant Price $ 63.15
Exercised/Vested, Weighted Average Exercise/Grant Price $ 48.62
Forfeited, Weighted Average Exercise/Grant Price $ 47.45
Nonvested share awards outstanding at March 31, 2012, Weighted Average Exercise/Grant Price $ 52.33
[1] The aggregate intrinsic value of outstanding and exercisable options at March 31, 2012 were $27.4 million and $18.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $65.75 per share on March 31, 2012 and the strike price of the underlying award.