Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Feb. 22, 2012
Sep. 27, 2011
Shareholders' Equity [Abstract]      
Shares authorized under share repurchase program     10
Stock repurchased and retired during period, shares 1.1    
Stock repurchased and retired during period, value $ 41,300,000    
Stock repurchased and retired during period, average price $ 36.73    
Shares remaining authorized for repurchase 8.1    
Cash dividend per common share   $ 0.125  
Dividend payment date Mar. 21, 2012    
Record date Mar. 07, 2012