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Long-Term Debt and Capital Leases (Details) (USD $)
In Millions, unless otherwise specified
Apr. 01, 2012
Jan. 01, 2012
Summary of Long-Term Debt    
Long term debt outstanding $ 386.6 $ 298.0
4.04% Senior Notes due September 2015 [Member]
   
Summary of Long-Term Debt    
Long term debt outstanding 75.0 75.0
Interest Rate, Stated Percentage 4.04%  
4.74% Senior Notes due September 2017 [Member]
   
Summary of Long-Term Debt    
Long term debt outstanding 100.0 100.0
Interest Rate, Stated Percentage 4.74%  
5.30% Senior Notes due September 2020 [Member]
   
Summary of Long-Term Debt    
Long term debt outstanding 75.0 75.0
Interest Rate, Stated Percentage 5.30%  
$550.0 million revolving credit facility, weighted average rate of 2.18% and 2.48% [Member]
   
Summary of Long-Term Debt    
Long term debt outstanding $ 136.6 $ 48.0
Weighted Average rate under credit facility 2.18% 2.48%