Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2012	Dec. 29, 2011
Cash and Cash Equivalents [Abstract]
Cash equivalent maturity period (in months)	3 months
Property, Plant and Equipment [Line Items]
Capital leases	$ 109.8	$ 130.4
Accumulated depreciation on capital leases	74.2	91.9
Asset Impairment Charges [Abstract]
Asset Impairment Charges	0	0
Leases [Abstract]
Lease Term Low End of Range (in years)	15 years
Lease Term High End of Range (in years)	20 years
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	7.1	7.1
Building | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Computer Equipment and Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Additions	0.4	0.2
Computer Equipment and Software | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Equipment and Software | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Capital Leases Included in Property and Equipment
Property, Plant and Equipment [Line Items]
Capital leases	2.7	2.7
Accumulated depreciation on capital leases	$ 2.1	$ 1.9