Income Taxes Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2012	Dec. 29, 2011	Dec. 30, 2010
Deferred Tax Assets, Net [Abstract]
Net operating loss carryforward	$ 11.6	$ 15.1
Excess of tax basis over book basis of fixed assets	14.2	15.4
Deferred revenue	9.6	9.8
Other	1.4	0.3
Total deferred tax assets before valuation allowance	36.8	40.6
Valuation allowance	(2.4)	(2.6)
Total deferred tax assets after valuation allowance	34.4	38.0
Deferred Tax Liabilities, Net [Abstract]
Deferred gain on sale of theatres	(26.4)	(27.9)
Excess of book basis over tax basis of intangible assets	(27.9)	(27.9)
Other	(1.9)	(1.4)
Total deferred tax liabilties	(56.2)	(57.2)
Net deferred tax liabilities	(21.8)	(19.2)
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Provision calculated at federal statutory income tax rate	5.1	3.5	2.5
State and local income taxes, net of federal benefit	2.7	1.0	0.5
Other	0	0	0.1
Total income tax provision	$ 7.8	$ 4.5	$ 3.1