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Debt - Fair Value of Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 24, 2012
Dec. 25, 2011
Debt Disclosure [Abstract]    
Principal $ 631.2 $ 631.8
Carrying amount 652.0 654.6
Fair value 676.8 642.7
Long-term debt premium $ 20.8 $ 22.8