Acquisitions - Pro Forma Financial Information, Nonrecurring Adjustments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma	$ (114.4)	$ (24.2)
Intangible amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma	16.2	32.8
Net change in stock compensation expense
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma	2.2	(1.4)
Net change in interest expense
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma	0	(9.9)
Net change in income tax benefit (expense)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss) adjustment, pro forma	$ 0	$ (1.6)
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	9.6	30.7