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Share-Based Compensation (Summary Of Share Incentive Plans) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Share-Based Compensation  
Outstanding Options, Number At December 31, 20101,847,136 
Weighted Average Exercise/Grant Price, balance at December 31, 2010$ 42.39 
Granted, Options Outstanding  
Granted, Weighted Average Exercise/Grant Price  
Exercised/Vested, Options Outstanding(501,173)(100,000)
Exercised/Vested, Weighted Average Exercise/Grant Price$ 42.64 
Forfeited, Options Outstanding  
Forfeited, Weighted Average Exercise/Grant Price  
Net activity, Options Outstanding(501,173) 
Outstanding Options, Number At September 30, 20111,345,963[1] 
Weighted Average Exercise/Grant Price, balance at September 30, 2011$ 42.26[1] 
Nonvested share awards outstanding at December 31, 2010, Share Awards Outstanding741,505 
Nonvested share awards outstanding at December 31, 2010, Weighted Average Exercise/Grant Price$ 42.16 
Granted, Share Awards Outstanding344,159 
Granted, Weighted Average Exercise/Grant Price$ 57.00 
Exercised/Vested, Share Awards Outstanding(235,093) 
Exercised/Vested, Weighted Average Exercise/Grant Price$ 46.74 
Forfeited, Share Awards Outstanding(16,024) 
Forfeited, Weighted Average Exercise/Grant Price$ 43.89 
Net activity, Nonvested Share Awards Outstanding93,042 
Nonvested share awards outstanding at September 30, 2011, Share Awards Outstanding834,547 
Nonvested share awards outstanding at September 30, 2011, Weighted Average Exercise/Grant Price$ 46.96 
[1]The aggregate intrinsic values of outstanding options and exercisable options at September 30, 2011 were $18.3 million and $9.3 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $55.26 per share on September 30, 2011 and the strike price of the underlying award.