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Capital Stock and ASR (Details) (USD $)
0 Months Ended 3 Months Ended
Feb. 28, 2012
Jan. 05, 2012
Mar. 21, 2012
Capital Stock And Accelerated Share Repurchase Details [Abstract]      
Stock Repurchased And Retired During Period Shares   800,000  
Accelerated Share Repurchases Initial Price Paid Per Share   $ 33.77  
Stock Repurchased During Period Value At Initial Price ASR Plan   $ 27,000,000  
Accelerated Share Repurchases Discount On Weighted Average Purchase Price Per Share $ 0.09   $ 0.09
Fair Value ASR Forward Contract At Inception   $ 0  
Stock Repurchased During Period Shares Accelerated Share Repurchase Plan     800,000