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Stock Repurchase Plan (Tables)

12 Months Ended

Dec. 31, 2011

Stock Repurchase Plan [Abstract]

Schedule Of Stock Repurchase Activity

		Number of  shares repurchased				Average price paid per share				Amount available for future repurchases (in millions)
2009			451,613			$	177.34			$	90.0
2010			687,340			$	168.06			$	107.7
2011			1,581,444			$	128.15			$	80.0

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