Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Jun. 25, 2014	Dec. 25, 2013
Guarantor Obligations [Line Items]
Guarantee liabilities included as a component of other noncurrent liabilities and deferred credits	$ 0.1	$ 0.1
Financial Guarantee [Member]
Guarantor Obligations [Line Items]
Loan amounts outstanding under the loan pools	6.8	6.1
Maximum payments guaranteed	1.7
Property Lease Guarantee [Member]
Guarantor Obligations [Line Items]
Maximum payments guaranteed	$ 2.0