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Debt And Bank Credit Facilities (Maturities Of Long-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 29, 2012
Floating Rate Series Two Thousand Seven Senior Notes Mature In August Two Thousand Seventeen [Member]
Dec. 29, 2012
Fixed Rate Series 2011A Mature In July 2018 [Member]
Dec. 29, 2012
Floating Rate Series Two Thousand Eleven Senior Notes Mature In July Two Thousand Twenty One [Member]
Dec. 29, 2012
Floating Rate Series Two Thousand Eleven Senior Notes Mature In July Two Thousand Twenty Three [Member]
Dec. 29, 2012
Floating Rate Series Two Thousand Seven Senior Notes Mature In August Two Thousand Fourteen [Member]
Dec. 29, 2012
Minimum [Member]
Floating Rate Series Two Thousand Eleven Senior Notes Mature In July Two Thousand Twenty One [Member]
Dec. 29, 2012
Minimum [Member]
Floating Rate Series Two Thousand Eleven Senior Notes Mature In July Two Thousand Twenty Three [Member]
Dec. 29, 2012
Maximum [Member]
Floating Rate Series Two Thousand Eleven Senior Notes Mature In July Two Thousand Twenty One [Member]
Dec. 29, 2012
Maximum [Member]
Floating Rate Series Two Thousand Eleven Senior Notes Mature In July Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum               4.80% 4.90%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum                   5.00% 5.10%
Senior Notes $ 750.0 $ 750.0 $ 100.0 $ 100.0 $ 230.0 $ 170.0 $ 150.0        
Debt Instrument, Interest Rate, Stated Percentage       4.10%              
2012 63.8                    
Long-term Debt, Maturities, Repayments of Principal in Year Two 150.2                    
Long-term Debt, Maturities, Repayments of Principal in Year Three 0.2                    
Long-term Debt, Maturities, Repayments of Principal in Year Four 3.0                    
Long-term Debt, Maturities, Repayments of Principal in Year Five 100.3                    
Long-term debt, Total 818.5 919.2                  
Debt Instrument, Interest Rate Terms     Floating (1)       Floating (1)        
Debt Instrument, Maturity Date     Aug. 01, 2017 Jul. 01, 2018 Jul. 01, 2021 Jul. 01, 2023 Aug. 01, 2014        
Long-term Debt, Maturities, Repayments of Principal after Year Five 501.0                    
Notes Payable $ 750.0