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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2011
Restricted Stock Units (RSUs) [Member]
Sep. 28, 2012
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2011
Restricted Stock Units (RSUs) [Member]
Sep. 28, 2012
Restricted Stock [Member]
Sep. 28, 2012
Dividend Equivalent Units (DEUs) [Member]
Jun. 29, 2012
Dividend Equivalent Units (DEUs) [Member]
Mar. 30, 2012
Dividend Equivalent Units (DEUs) [Member]
Sep. 28, 2012
Maximum [Member]
Restricted Stock Units (RSUs) [Member]
Sep. 28, 2012
Minimum [Member]
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Proceeds from stock options exercised $ 6.6 $ 21.8                    
Excess Tax Benefit from Share-based Compensation, Operating Activities 3.8 0                    
Price per share               $ 24.51 $ 23.45 $ 22.84    
Share-based Payment Award Nonvested, Number               619 646 660    
Restricted Stock Units, Number of Units Granted                     100.00% 0.00%
Restricted Stock Awards, Awards that Will Vest, Period         3 years   6 months          
Restricted Stock Awards, Percent that Vest on the Date of Grant             50.00%          
Restricted Stock Awards, Percent that Vest upon retirement             0.5          
Compensation Expense     $ 0.3 $ 0 $ 0.9 $ 0