Stock-Based Compensation (Summary Of Changes In Stock Options Awarded) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Stock-Based Compensation [Abstract]
Outstanding at 12/31/10, shares	2,935,250
Weighted average exercise price outstanding at 12/31/10	$ 43.588
Exercised, shares	(1,999,975)
Weighted average exercise price	$ 43.844
Forfeited, shares	(8,250)
Weighted average exercise price, forfeited	$ 42.253
Outstanding at 12/31/11, shares	927,025
Weighted average exercise price outstanding at 12/31/11	$ 43.046