Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012	Dec. 30, 2012	May 27, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits that if recognized would affect effective tax rate			$ 13.4
Income tax penalties and interest expense	0	0.2
Benefit for interest and penalties related to reversal of prior positions	(0.1)
Liabilities for uncertain tax positions that will expire within 12 months	1.5
Federal annual utilization of NOL carryforwards limit, next five years				28.1
Federal annual utilization of NOL carryforwards limit, after year five				11.6
Discontinued operations
Income Tax Contingency [Line Items]
Unrecognized tax benefits reduction relating to expiration of statutes of limitations	$ 0.1