Acquisitions - Pro Forma Financial Information, Nonrecurring Adjustments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net loss from above	$ (10.3)	$ (3.0)
Intangible amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net loss from above		4.0
Net change in stock compensation expense
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net loss from above		$ 0.7
Increase in weighted average common shares outstanding for shares issued and not already included in the weighted average common shares outstanding
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Weighted average number of basic shares outstanding adjustment, pro forma		24.0