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Debt - Fair Value of Long-term Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 25, 2011
Debt Disclosure [Abstract]
Principal amount outstanding	$ 631.0	$ 631.8
Carrying amount	650.7	654.6
Fair value	678.2	642.7
Long-term debt premium	$ 19.7	$ 22.8

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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